EP0160856A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for coating phosphor particles, phosphor particle, fluorescent lamp, and manufacturing method
Assignee: Osram Sylvania Inc
•
Filing: 1985-04-12
•
Granted: —
•
Expires: 2005-04-12
Abstract
Abstract Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of the protective coating on individual particles of a phosphor powder while the phosphor particles are suspended in a fluidized bed. During the method, the fluidized particles are exposed to the vaporized coating precursor material at a first temperature, which is less than the decomposition temperature of the precursor material, and the precursor material is ' reacted to form the desired coating material at a second temperature, which is greater than or equal to the temperature at which the precursor material reacts to form the coating material. A phosphor particle having a continuous protective coating is also disclosed. A method for improving the lumen maintenance of a fluorescent lamp and a fluorescent lamp (24) having improved maintenance are further disclosed. The method involves applying a non-particulate, conformal aluminum oxide coating to the outer surface of individual particles of a finely-divided fluorescent lamp phosphor, applying the coated phosphor particles to a fluorescent lamp envelope (25), and processing the phosphor coated envelope into a finished lamp.
Inventors
- 👤 Gary A. Sigai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 10:52
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 72
Claim 1
Independent Claim
114 words
A method for forming a protective coating on phosphor particles comprising: (a) fluidizing particles of a phosphor powder in a fluidized bed; (b) exposing the fluidized particles to a vaporized coating precursor at a first temperature to envelop the particles with coating precursor material, said first temperature being less than the temperature at which the coating precursor material decomposes; and (c) reacting the coating precursor material enveloping the fluidized particles at a second temperature to form a continuous protective coating of predetermined thickness on the surface of individual phosphor particles, - said second temperature being greater than or equal to the temperature at which the coating precursor material reacts to form the protective coating.
Claim 2
Independent Claim
114 words
A method for forming a protective coating on phosphor particles comprising: (a) fluidizing particles of a phosphor powder in a fluidized bed; (b) exposing the fluidized particles to a vaporized coating precursor at a first temperature to envelop the particles with coating precursor material, said first temperature being less than the temperature at which the coating precursor material decomposes; and (c) reacting the coating precursor material enveloping the fluidized particles at a second temperature to form a continuous protective coating of predetermined thickness on the surface of individual phosphor particles, - said second temperature being greater than or equal to the temperature at which the coating precursor material reacts to form the protective coating.
Claim 3
Dependent Claim
34 words
A method in accordance with claim 1 wherein the phosphor powder is a fine phosphor powder, said method further comprising: agitating particles in the fluidized bed with agitating means while said particles are fluidized.
Claim 4
Dependent Claim
29 words
A method in accordance with claim 1 wherein the phosphor powder comprises a uniform mixture of a fine phosphor powder and up to about 1 weight percent fluidizing aid.
Claim 5
Dependent Claim
15 words
A method in accordance with claim 2 wherein the protective coating is a refractory oxide.
Claim 6
Dependent Claim
17 words
5 . A method in accordance with claim 3 wherein the protective coating is a refractory oxide.
Claim 7
Independent Claim
184 words
A method for forming a protective coating on phosphor particles comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through particulate phosphor powder to form a fluidized bed and to envelop particles of the phosphor powder with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with vapor of the coating precursor material on the particles of phosphor powder to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 8
Independent Claim
184 words
A method for forming a protective coating on phosphor particles comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through particulate phosphor powder to form a fluidized bed and to envelop particles of the phosphor powder with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with vapor of the coating precursor material on the particles of phosphor powder to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 9
Dependent Claim
26 words
A method in accordance with claim 6 wherein said inert carrier gas is selected from the group consisting of nitrogen, argon, helium, neon, and mixtures thereof.
Claim 10
Dependent Claim
17 words
A method in accordance with claim 6 wherein said oxidizing gas is diluted with an inert gas.
Claim 11
Dependent Claim
16 words
A method in accordance with claim 6 wherein said protective coating material is a refractory oxide.
Claim 12
Independent Claim
143 words
A method for forming a protective coating on phosphor particles comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through particulate phosphor powder to form a fluidized bed and to envelop particles of the phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 13
Independent Claim
143 words
A method for forming a protective coating on phosphor particles comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through particulate phosphor powder to form a fluidized bed and to envelop particles of the phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 14
Dependent Claim
16 words
A method in accordance with claim 10 wherein the protective coating material is a refractory oxide.
Claim 15
Independent Claim
213 words
A method for forming a continuous coating on phosphor particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through a mixture of a fine phosphor powder and up to about 1 weight percent of a fluidizing aid to form a fluidized bed in which the particles are suspended in the carrier gas and to envelop the fluidized particles with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with the vapor of the coating precursor material on the particles of phosphor powder to form a continuous coating of predetermined thickness on the phosphor particle.
Claim 16
Independent Claim
213 words
A method for forming a continuous coating on phosphor particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through a mixture of a fine phosphor powder and up to about 1 weight percent of a fluidizing aid to form a fluidized bed in which the particles are suspended in the carrier gas and to envelop the fluidized particles with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with the vapor of the coating precursor material on the particles of phosphor powder to form a continuous coating of predetermined thickness on the phosphor particle.
Claim 17
Dependent Claim
31 words
A method in accordance with claim 12 further comprising the step of agitating particles in the fluidized bed while said particles are suspended in the fluidized bed by the carrier gas.
Claim 18
Dependent Claim
25 words
A method in accordance with claim 13 wherein said fluidizing aid is selected from the group consisting of small particle alumina and small particle silica.
Claim 19
Dependent Claim
26 words
A method in accordance with claim 13 wherein said inert carrier gas is selected from the group consisting of nitrogen, argon, helium, neon, and mixtures thereof.
Claim 20
Dependent Claim
17 words
A method in accordance with claim 13 wherein said oxidizing gas is diluted with an inert gas.
Claim 21
Dependent Claim
17 words
A method in accordance with claim 13 wherein said coating precursor material is a volatilizable organometallic compound.
Claim 22
Dependent Claim
17 words
A method in accordance with claim 13 wherein said coating precursor material is a volatizable metal- acetylacetonate.
Claim 23
Dependent Claim
18 words
A method in accordance with claim 13 wherein said coating precursor material is a volatilizable metal alkoxide compound.
Claim 24
Independent Claim
217 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through a fine particulate phosphor powder to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) agitating particles with agitating means in the fluidized bed while said particles are suspended in the fluidized bed by the carrier gas; and (d) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with vapor of the coating precursor material on the particles of the fine phosphor powder to form a continuous. coating of predetermined thickness on the phosphor particles.
Claim 25
Independent Claim
217 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable coating precursor material into an inert carrier gas to form a carrier gas containing vaporized coating precursor material; (b) passing said carrier gas containing the vaporized coating precursor material through a fine particulate phosphor powder to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the coating precursor material reacts with an oxidizing gas to form a desired coating material; (c) agitating particles with agitating means in the fluidized bed while said particles are suspended in the fluidized bed by the carrier gas; and (d) passing oxidizing gas into said fluidized bed separately from said carrier gas containing the vaporized coating precursor material and reacting said oxidizing gas with vapor of the coating precursor material on the particles of the fine phosphor powder to form a continuous. coating of predetermined thickness on the phosphor particles.
Claim 26
Dependent Claim
15 words
A method in accordance with claim 20 wherein the protective coating is a refractory oxide.
Claim 27
Independent Claim
164 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through a mixture of a fine particulate phosphor powder and up to about 1 weight percent of a fluidizing aid to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temper--ature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 28
Independent Claim
164 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through a mixture of a fine particulate phosphor powder and up to about 1 weight percent of a fluidizing aid to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temper--ature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles.
Claim 29
Dependent Claim
34 words
A method in accordance with claim 22 further comprising the step of agitating particles in the fluidized bed with agitating means while said particles are suspended in the fluidized bed by the carrier gas.
Claim 30
Dependent Claim
15 words
A method in accordance with claim 22 wherein the protective coating is a refractory oxide.
Claim 31
Independent Claim
173 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through a fine particulate phosphor powder to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature'at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles; and (c) agitating particles with agitating means in the fluidized bed while said particles are suspended in the fluidized bed by the carrier gas.
Claim 32
Independent Claim
173 words
A method for forming a protective coating on particles of a fine phosphor powder comprising: (a) vaporizing a volatilizable oxygen-containing coating precursor material into an inert carrier gas to form a carrier gas containing vaporized oxygen-containing coating precursor material; (b) passing said carrier gas containing the vaporized oxygen-containing coating precursor material through a fine particulate phosphor powder to form a fluidized bed and to envelop particles of the fine phosphor powder with vapor of the oxygen-containing coating precursor material contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being less than the temperature'at which said oxygen-containing coating precursor material decomposes and said highest temperature being equal to or greater than the temperature at which the oxygen-containing coating precursor material reacts to form a continuous coating of predetermined thickness on the phosphor particles; and (c) agitating particles with agitating means in the fluidized bed while said particles are suspended in the fluidized bed by the carrier gas.
Claim 33
Dependent Claim
15 words
A method in accordance with claim 25 wherein the protective coating is a refractory oxide.
Claim 34
Independent Claim
212 words
A method for forming a continuous aluminum oxide coating upon particles of a cool white alkaline earth halophosphate phosphor comprising: (a) vaporizing trimethyl aluminum into an inert carrier gas consisting of nitrogen to form a carrier gas containing vaporized trimethyl aluminum; (b) passing said carrier gas containing vaporized trimethyl aluminum through a mixture of cool white alkaline earth halophosphate phosphor powder and up to about 1 weight percent small particle alumina to form a fluidized bed in which the particles are suspended in the carrier gas and to envelop particles of the phosphor powder with vapor of the trimethyl aluminum contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being from about 60°C to about 150°C and said highest temperature being from about 450°C to about 650°C; (c) agitating particles of the phosphor while said particles are suspended in the fluidized bed by the carrier gas; (d) passing oxidizing gas consisting essentially of oxygen into said fluidized bed separately from said carrier gas containing vaporized trimethyl aluminum and reacting said oxygen with the trinethyl aluminum vapor on the calcium halophosphate particles to form a continuous aluminum oxide coating of predetermined thickness on the phosphor particles.
Claim 35
Independent Claim
212 words
A method for forming a continuous aluminum oxide coating upon particles of a cool white alkaline earth halophosphate phosphor comprising: (a) vaporizing trimethyl aluminum into an inert carrier gas consisting of nitrogen to form a carrier gas containing vaporized trimethyl aluminum; (b) passing said carrier gas containing vaporized trimethyl aluminum through a mixture of cool white alkaline earth halophosphate phosphor powder and up to about 1 weight percent small particle alumina to form a fluidized bed in which the particles are suspended in the carrier gas and to envelop particles of the phosphor powder with vapor of the trimethyl aluminum contained in the carrier gas, said fluidized bed being maintained in a temperature gradient ranging from a lowest temperature to a highest temperature, said lowest temperature being from about 60°C to about 150°C and said highest temperature being from about 450°C to about 650°C; (c) agitating particles of the phosphor while said particles are suspended in the fluidized bed by the carrier gas; (d) passing oxidizing gas consisting essentially of oxygen into said fluidized bed separately from said carrier gas containing vaporized trimethyl aluminum and reacting said oxygen with the trinethyl aluminum vapor on the calcium halophosphate particles to form a continuous aluminum oxide coating of predetermined thickness on the phosphor particles.
Claim 36
Dependent Claim
42 words
A method in accordance with claim 27 wherein steps (a) through (d) are continued for a period of time sufficient to form a continuous aluminum oxide coating having a thickness greater than or equal to about 100 Angstroms on the phosphor particles.
Claim 37
Dependent Claim
15 words
A phosphor particle having a continuous protective coating surrounding the outer surface of the particle.
Claim 38
Dependent Claim
15 words
A phosphor particle having a continuous protective coating surrounding the outer surface of the particle.
Claim 39
Dependent Claim
18 words
A particle of a finely-divided fluorescent lamp phosphor having a continuous coating of aluminum oxide surrounding the particle.
Claim 40
Dependent Claim
18 words
A particle of a finely-divided fluorescent lamp phosphor having a continuous coating of aluminum oxide surrounding the particle.
Claim 41
Dependent Claim
15 words
A particle in accordance with claim 30 wherein the phosphor is alkaline earth halophosphate phosphor.
Claim 42
Dependent Claim
15 words
A particle in accordance with claim 30 wherein the phosphor is manganese-doped zinc orthosilicate phosphor.
Claim 43
Independent Claim
87 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of " (a) depositing a continuous aluminum oxide coating on individual particles of a finely-divided fluorescent lamp phosphor to form individually and continuously coated phosphor particles; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 44
Independent Claim
87 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of " (a) depositing a continuous aluminum oxide coating on individual particles of a finely-divided fluorescent lamp phosphor to form individually and continuously coated phosphor particles; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 45
Dependent Claim
17 words
A method in accordance with claim 33 wherein said finely-divided fluorescent lamp phosphor is alkaline earth halophosphate.
Claim 46
Dependent Claim
17 words
A method in accordance with claim 33 wherein said finely-divided fluorescent lamp phosphor is manganese-doped zinc orthosilicate.
Claim 47
Dependent Claim
38 words
A method in accordance with claim 33 wherein the continuous aluminum oxide coating is deposited on the individual particles of a finely-divided fluorescent lamp phosphor by chemical vapor deposition while the particles are suspended in a fluidized bed.
Claim 48
Dependent Claim
113 words
A method in accordance with claim 33 wherein the continuous aluminum oxide coating is deposited on the individual particles of a finely-divided fluorescent lamp phosphor powder by chemical vapor deposition while the particles are suspended in a fluidized bed, the fluidized particles being exposed to a vaporized aluminum-containing precursor material at a first temperature, the first temperature being less than the temperature at which the precursor material decomposes, and the precursor material being reacted to form a continuous aluminum oxide coating on the surface of the individual particles at a second temperature, the second temperature being greater than or equal to the temperature at which the precursor material reacts to form aluminum oxide.
Claim 49
Independent Claim
119 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided fluorescent lamp phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least .one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 50
Independent Claim
119 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided fluorescent lamp phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least .one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 51
Independent Claim
121 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided cool-white alkaline earth halophosphate phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 52
Independent Claim
121 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided cool-white alkaline earth halophosphate phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 53
Independent Claim
120 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided manganese-doped zinc orthosilicate phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 54
Independent Claim
120 words
A method for improving lumen maintenance of fluorescent lamps comprising the steps of (a) coating individual particles of a finely-divided manganese-doped zinc orthosilicate phosphor powder by fluidizing the powder and applying a continuous aluminum oxide coating to the individual particles by chemical vapor deposition while the particles are suspended in a fluidized bed to form individually and continuously coated phosphor particles, each particle being surrounded by a continuous aluminum oxide coating; (b) applying one or more layers of phosphor to a fluorescent lamp envelope to form a phosphor coated envelope, at least one of the phosphor layers having a phosphor component comprising said individually and continuously coated phosphor particle; and (c) processing said phosphor coated envelope into a finished lamp.
Claim 55
Dependent Claim
59 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising individual particles of a finely-divided fluorescent lamp phosphor which have been individually coated with a continuous aluminum oxide coating.
Claim 56
Dependent Claim
59 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising individual particles of a finely-divided fluorescent lamp phosphor which have been individually coated with a continuous aluminum oxide coating.
Claim 57
Dependent Claim
19 words
A fluorescent lamp in accordance with claim 41 wherein the finely-divided fluorescent lamp phosphor is alkaline earth halophosphate phosphor.
Claim 58
Dependent Claim
19 words
A fluorescent lamp in accordance with claim 41 wherein the finely-divided fluorescent lamp phosphor is manganese-doped zinc orthosilicate phosphor.
Claim 59
Dependent Claim
66 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of a finely-divided fluorescent lamp phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 60
Dependent Claim
66 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of a finely-divided fluorescent lamp phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 61
Dependent Claim
65 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of alkaline earth halophosphate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 62
Dependent Claim
65 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of alkaline earth halophosphate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 63
Dependent Claim
67 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of a manganese-doped zinc orthosilicate phosphor powder which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 64
Dependent Claim
67 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with one or more layers of phosphor, at least one of the phosphor layers having a phosphor component comprising particles of a manganese-doped zinc orthosilicate phosphor powder which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 65
Dependent Claim
44 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of a finely-divided fluorescent lamp phosphor powder which have been individually coated with a continuous aluminum oxide coating.
Claim 66
Dependent Claim
44 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of a finely-divided fluorescent lamp phosphor powder which have been individually coated with a continuous aluminum oxide coating.
Claim 67
Dependent Claim
19 words
A fluorescent lamp in accordance with claim 47 wherein the finely-divided fluorescent lamp phosphor is alkaline earth halophosphate phosphor.
Claim 68
Dependent Claim
19 words
A fluorescent lamp in accordance with claim 47 wherein the finely-divided fluorescent lamp phosphor is manganese-doped zinc orthosilicate phosphor.
Claim 69
Dependent Claim
50 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of alkaline earth halophosphate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 70
Dependent Claim
50 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of alkaline earth halophosphate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 71
Dependent Claim
51 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of a manganese-doped zinc orthosilicate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
Claim 72
Dependent Claim
51 words
A fluorescent lamp comprising a glass envelope having an inner wall wherein the inner wall of the glass envelope is coated with a phosphor comprising particles of a manganese-doped zinc orthosilicate phosphor which have been individually coated with a continuous aluminum oxide coating by chemical vapor deposition in a fluidized bed.
References Cited (Backward Citations)
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