US3826946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor discharge lamp electrode having carbon-coated areas
Assignee: General Electric Co
•
Filing: 1973-05-24
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Granted: 1974-07-30
•
Expires: 1993-05-24
Abstract
Abstract A carbon coating is provided on the filament end regions, and also on the adjacent support wires and anodes, of an electrode structure for a low pressure mercury vapor discharge lamp, such as a fluorescent lamp. This results in improved lamp efficiency and reduced oxide ring formation at the lamp ends.
Inventors
- 👤 J Paynter
- 👤 E Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:59
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/02; H01K1/04; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A structure as claimed in claim 1 in which said coating of carbon covers substantially the entirety of said exposed metal surfaces.
Claim 2
Dependent Claim
30 words
A structure as claimed in claim 2 including anode areas comprising said exposed metal surfaces, and in which said coating of carbon covers substantially the entirety of said anode areas.
Claim 3
Dependent Claim
106 words
A vapor discharge lamp comprising an elongated bulb and a pair of electrode structures sealed at the respective ends of said bulb, each of said electrode structures comprising a pair of support wires, an elongated filament attached at spaced apart points thereof to said support wires, and an electron-emitting cathode material carried on the central portion of said filament intermediate said support wires, wherein the improvement comprises a coating of carbon carried on at least a portion of the exposed metal surfaces comprising the end regions of said filaments and the regions of said support wires adjacent to the filaments on both of said electrode structures.
Claim 4
Dependent Claim
28 words
A lamp as claimed in claim 4 in which said coating of carbon covers substantially the entirety of said exposed metal surfaces on both of said electrode structures.
Claim 5
Dependent Claim
41 words
A lamp as claimed in claim 5 in which each of said electrode structures includes anode areas comprising said exposed metal surfaces, and in which said coating of carbon covers substantially the entirety of said anode areas of both electrode structures.
Claim 6
Dependent Claim
18 words
A lamp as claimed in claim 4 in which said lamp is a low pressure mercury vapor lamp.
References Cited (Backward Citations)
US3538373A
Cited
US3706895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |