US3868266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina coatings for an electric lamp
Assignee: General Electric Co
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Filing: 1973-06-21
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Granted: 1975-02-25
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Expires: 1993-06-21
Abstract
Abstract This invention relates to methods and materials for providing a light-diffusion coating in an electric lamp which comprises a thin layer of spherical alumina particles that have been vapordeposited in a particular size range to provide more effective light scattering. The coatings are deposited upon the interior surface of the sealed glass envelope and have been found especially useful for incandescent lamps as well as for such other lamps as electric discharge lamps.
Inventors
- 👤 David C Henderson
- 👤 Kenneth M Maloney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:36
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01K; H01K3/00; H01K3/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A METHOD OF DEPOSITING A LIGHT-DIFFUSION COATING UPON THE INTERNAL SURFACE OF A LAMP GLASS ENVELOPE WHICH COMPRISES: A. FORMING A COMBUSTIBLE LIQUID MEDIUM WITH A LIQUID ORGANIC ALUMINUM COMPOUND OR BY DISSOLVING A SOLID ORGANIC ALUMINUM COMPOUND IN AN ORGANIC LIQUID SOLVENT B. BURNING SAID COMBUSTIBLE LIQUID MEDIUM WITHIN THE LAMP GLASS ENVELOPE UTILIZING AN OZYGEN CONTAINING ATMOSPHERE TO FORM A MOVING GAS STREAM HAVING SPHERICAL ALUMINA PARTICLES WITH AN INDIVIDUAL PARTICLE SIZE RANGE FROM APPROXIMATELY 400 A TO 5,000 A IN A DIAMETER BEING SUSPENDED IN SAID GAS STREAM, AND C. CONTROLLING THE FLOW RATE OF THE MOVING GAS STREAM WITHIN THE LAMP GLASS ENVELOPE TO UNIFORMLY DEPOSIT THE ALUMINA PARTICLES UPON THE UNTREATED INTERNAL SURFACE OF THE LAMP GLASS ENVELOPE.
Claim 2
Independent Claim
123 words
A METHOD OF DEPOSITING A LIGHT-DIFFUSION COATING UPON THE INTERNAL SURFACE OF A LAMP GLASS ENVELOPE WHICH COMPRISES: A. FORMING A COMBUSTIBLE LIQUID MEDIUM WITH A LIQUID ORGANIC ALUMINUM COMPOUND OR BY DISSOLVING A SOLID ORGANIC ALUMINUM COMPOUND IN AN ORGANIC LIQUID SOLVENT B. BURNING SAID COMBUSTIBLE LIQUID MEDIUM WITHIN THE LAMP GLASS ENVELOPE UTILIZING AN OZYGEN CONTAINING ATMOSPHERE TO FORM A MOVING GAS STREAM HAVING SPHERICAL ALUMINA PARTICLES WITH AN INDIVIDUAL PARTICLE SIZE RANGE FROM APPROXIMATELY 400 A TO 5,000 A IN A DIAMETER BEING SUSPENDED IN SAID GAS STREAM, AND C. CONTROLLING THE FLOW RATE OF THE MOVING GAS STREAM WITHIN THE LAMP GLASS ENVELOPE TO UNIFORMLY DEPOSIT THE ALUMINA PARTICLES UPON THE UNTREATED INTERNAL SURFACE OF THE LAMP GLASS ENVELOPE.
Claim 3
Dependent Claim
18 words
A method as in claim 1 wherein the oxygen containing atmosphere is oxygen at a predetermined flow rate.
Claim 4
Dependent Claim
33 words
A method as in claim 1 utilizing a burner construction to impart a flow direction to the moving gas stream which is substantially tangential to the internal surface of the lamp glass envelope.
Claim 5
Dependent Claim
26 words
A method as in claim 3 wherein the lamp glass envelope is rotated in a direction opposite to the flow direction of the moving gas stream.
Claim 6
Dependent Claim
14 words
A method as in claim 1 wherein the combustible liquid medium comprises aluminum sec-butoxide.
Claim 7
Dependent Claim
21 words
A method as in claim 1 wherein the combustible liquid medium comprises a heated solution of aluminum isopropoxide dissolved in isopropanol.
Claim 8
Independent Claim
206 words
A method of depositing a light-diffusion coating upon the internal surface of a lamp glass envelope which comprises: a. dissolving a short-chain aluminum organic compound in an organic liquid solvent to form a combustible liquid medium, b. disposing a burner construction within the lamp glass envelope and rotating the lamp glass envelope, c. concurrently feeding a stream of said combustible liquid medium to said burner construction along with oxygen to form an ignitable mixture and igniting said mixture to provide a heated gas stream having suspended therein spherical alumina particles with an individual particle size range from approximately 400 A to 5,000 A in diameter, d. introducing non-spherical alumina partIcles to said burner for suspension in said moving gas stream, e. causing the moving gas stream to flow in a direction opposed to said rotation and tangential to the internal surface of the lamp glass envelope, f. regulating the velocity flow rate of said gas stream with respect to the rotational velocity of said interior surface of the lamp glass envelope so that a minimal velocity gradient exists therebetween adjacent said internal surfaces, and g. uniformly codepositing said non-spherical alumina particles with said spherical alumina particles upon the untreated internal surface of the lamp glass envelope.
Claim 9
Independent Claim
206 words
A method of depositing a light-diffusion coating upon the internal surface of a lamp glass envelope which comprises: a. dissolving a short-chain aluminum organic compound in an organic liquid solvent to form a combustible liquid medium, b. disposing a burner construction within the lamp glass envelope and rotating the lamp glass envelope, c. concurrently feeding a stream of said combustible liquid medium to said burner construction along with oxygen to form an ignitable mixture and igniting said mixture to provide a heated gas stream having suspended therein spherical alumina particles with an individual particle size range from approximately 400 A to 5,000 A in diameter, d. introducing non-spherical alumina partIcles to said burner for suspension in said moving gas stream, e. causing the moving gas stream to flow in a direction opposed to said rotation and tangential to the internal surface of the lamp glass envelope, f. regulating the velocity flow rate of said gas stream with respect to the rotational velocity of said interior surface of the lamp glass envelope so that a minimal velocity gradient exists therebetween adjacent said internal surfaces, and g. uniformly codepositing said non-spherical alumina particles with said spherical alumina particles upon the untreated internal surface of the lamp glass envelope.
Claim 10
Dependent Claim
14 words
A method as in claim 7 wherein the combustible liquid medium comprises aluminum sec-butoxide.
Claim 11
Dependent Claim
21 words
A method as in claim 7 wherein the combustible liquid medium comprises a heated solution of aluminum isopropoxide dissolved in isopropanol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |