Patent US5449971A successfully refreshed from Google Patents.
US5449971A
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Method, composition, and means for limiting lead wire arcing in an arc discharge lamp
Assignee: General Electric Co
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Filing: 1993-08-31
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Granted: 1995-09-12
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Expires: 2013-08-31
Abstract
Abstract A material is provided on the lead wires that support a filament of a fluorescent lamp assembly to inhibit arcing associated with filament burnout. The material comprises a glass that is non-alkaline. Another preferred arrangement is to incorporate a material into the assembly that will release an arc inhibiting gas in response to arcing of the lead wires. For example, a calcium carbonate or strontium carbonate material releases carbon dioxide to terminate undesired lead wire arcing.
Inventors
- 👤 Curtis E. Scott
- 👤 Harihar D. Chevali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/36
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
71 words
In an arc discharge lamp assembly having a envelope containing a pressurized gas, an electrode assembly in the envelope that includes a filament mounted on terminal ends of a pair of lead wires for exciting the pressurized gas, the improvement comprising: a material placed on at least one of the lead wires at a region spaced from the filament for limiting arcing of the lead wires when the filament burns out.
Claim 2
Dependent Claim
71 words
In an arc discharge lamp assembly having a envelope containing a pressurized gas, an electrode assembly in the envelope that includes a filament mounted on terminal ends of a pair of lead wires for exciting the pressurized gas, the improvement comprising: a material placed on at least one of the lead wires at a region spaced from the filament for limiting arcing of the lead wires when the filament burns out.
Claim 3
Dependent Claim
31 words
The arc discharge lamp assembly as defined in claim 1 wherein the material is a glass bead that releases an arc inhibiting gas in response to arcing of the lead wires.
Claim 4
Dependent Claim
28 words
The arc discharge lamp assembly as defined in claim 1 wherein the material is a glass bead disposed on the lead wires at a region adjacent the filament.
Claim 5
Dependent Claim
29 words
The arc discharge lamp assembly as defined in claim 3 wherein the glass bead includes a material that releases CO 2 in response to arcing of the lead wires.
Claim 6
Dependent Claim
25 words
The arc discharge lamp assembly as defined in claim 1 wherein the material includes a non-alkaline glass that supports the lead wires in spaced relation.
Claim 7
Dependent Claim
17 words
The arc discharge lamp assembly as defined in claim 1 wherein the material is devoid of sodium.
Claim 8
Independent Claim
40 words
A method for eliminating arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising the steps of supporting said filament upon a pair of lead wires; and supporting said lead wires in a non-alkaline glass bead.
Claim 9
Independent Claim
40 words
A method for eliminating arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising the steps of supporting said filament upon a pair of lead wires; and supporting said lead wires in a non-alkaline glass bead.
Claim 10
Independent Claim
54 words
A method for eliminating arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising the steps of: supporting the filament upon a pair of lead wires; and providing a material on the lead wires that releases an arc inhibiting gas in response to arcing of one of the lead wires.
Claim 11
Independent Claim
54 words
A method for eliminating arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising the steps of: supporting the filament upon a pair of lead wires; and providing a material on the lead wires that releases an arc inhibiting gas in response to arcing of one of the lead wires.
Claim 12
Dependent Claim
14 words
The method of claim 8 wherein said material comprises a carbonate-low melting glass blend.
Claim 13
Dependent Claim
18 words
The method of claim 9 wherein said carbonate is selected from calcium carbonate, strontium carbonate, and barium carbonate.
Claim 14
Dependent Claim
21 words
The method of claim 9 wherein said low melting glass has a melting temperature below the decomposition point of the carbonate.
Claim 15
Dependent Claim
16 words
The method of claim 8 wherein said material releases CO 2 upon contact by said arc.
Claim 16
Dependent Claim
46 words
A composition for eliminating the discharge caused by arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising a blend of a carbonate and a low melting glass which evolves an arc inhibiting gas upon contact of said composition by said arc.
Claim 17
Dependent Claim
46 words
A composition for eliminating the discharge caused by arcing of the lead wires in an arc discharge lamp upon filament burn-out comprising a blend of a carbonate and a low melting glass which evolves an arc inhibiting gas upon contact of said composition by said arc.
Claim 18
Dependent Claim
18 words
The composition of claim 13 wherein said carbonate is selected from calcium carbonate, strontium carbonate, and barium carbonate.
Claim 19
Dependent Claim
17 words
The composition of claim 13 wherein said blend has a carbonate to glass ratio of about 10%-40%.
Claim 20
Dependent Claim
77 words
In a fluorescent light assembly having a tube containing a pressurized gas and a luminescent coating on an interior surface of the tube, an electrode assembly in the tube that includes a filament mounted on terminal ends of a pair of lead wires for exciting the pressurized gas, the improvement comprising: a material placed on the lead wires at a region spaced from the filament for limiting arcing of the lead wires when the filament burns out.
Claim 21
Dependent Claim
77 words
In a fluorescent light assembly having a tube containing a pressurized gas and a luminescent coating on an interior surface of the tube, an electrode assembly in the tube that includes a filament mounted on terminal ends of a pair of lead wires for exciting the pressurized gas, the improvement comprising: a material placed on the lead wires at a region spaced from the filament for limiting arcing of the lead wires when the filament burns out.
Claim 22
Dependent Claim
23 words
The fluorescent light assembly as defined in claim 16 wherein the material is a non-alkaline glass composition used to support the lead wires.
Claim 23
Dependent Claim
25 words
The fluorescent light assembly as defined in claim 16 wherein the material releases an arc inhibiting gas in response to arcing of the lead wires.
Claim 24
Dependent Claim
24 words
The fluorescent light assembly as defined in claim 18 wherein the material includes a carbonate and the arc inhibiting gas is CO 2 .
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) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |