Patent US1688656A successfully refreshed from Google Patents.
US4918352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal halide lamps with oxidized frame parts
Assignee: General Electric Co
•
Filing: 1988-11-07
•
Granted: 1990-04-17
•
Expires: 2008-11-07
Abstract
Abstract Metal halide lamps having better lumen maintenance over the life of the lamp contain metal frame parts whose surface is oxidized either prior to lamp assembly or oxidized in-situ during operation of the lamp by oxygen or an oxidizing agent present inside the outer vitreous envelope.
Inventors
- 👤 Carl H. Hess
- 👤 Frank I. Ewing
- 👤 Ralph M. Potter
- 👤 Timothy D. Russell
- 👤 Edward G. Zubler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:57
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34; H01J61/82; H01J61/827
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A metal halide arc discharge lamp comprising an arc tube supported within an outer vitreous envelope by metal frame parts having a nickel surface wherein the arc tube contains a fill comprising mercury, a sodium halide and an inert starting gas and wherein an oxidizing agent is present within the inside of said outer envelope in an amount sufficient to release oxygen in an amount equivalent to about 2 ×10 -6 to 2 ×10 -3 moles per liter of outer envelope volume to oxidize the surface of said metal frame parts during operation of the lamp.
Claim 2
Dependent Claim
96 words
A metal halide arc discharge lamp comprising an arc tube supported within an outer vitreous envelope by metal frame parts having a nickel surface wherein the arc tube contains a fill comprising mercury, a sodium halide and an inert starting gas and wherein an oxidizing agent is present within the inside of said outer envelope in an amount sufficient to release oxygen in an amount equivalent to about 2 ×10 -6 to 2 ×10 -3 moles per liter of outer envelope volume to oxidize the surface of said metal frame parts during operation of the lamp.
Claim 3
Dependent Claim
89 words
A metal halide arc discharge lamp comprising an arc tube supported within a vitreous envelope by metal frame parts which comprise a nickel plated iron alloy, wherein the arc tube contains a fill comprising mercury, a sodium halide and an inert starting gas, wherein oxygen is present in said outer envelope in an amount of from about 2 ×10 -6 to 2 ×10 -3 moles per liter of volume enclosed within said vitreous envelope and wherein an inert gas is also present within the inside of said vitreous envelope.
Claim 4
Dependent Claim
89 words
A metal halide arc discharge lamp comprising an arc tube supported within a vitreous envelope by metal frame parts which comprise a nickel plated iron alloy, wherein the arc tube contains a fill comprising mercury, a sodium halide and an inert starting gas, wherein oxygen is present in said outer envelope in an amount of from about 2 ×10 -6 to 2 ×10 -3 moles per liter of volume enclosed within said vitreous envelope and wherein an inert gas is also present within the inside of said vitreous envelope.
References Cited (Backward Citations)
US2951959A
Cited
US3234421A
Cited
US3452238A
Cited
US3519864A
Cited
US3569766A
Cited
US3737710A
Cited
US3937996A
Cited
US3946262A
Cited
US4581557A
Cited
US4499396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |