Patent US4949003A successfully refreshed from Google Patents.
US4949003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen protected electric lamp
Assignee: Osram Sylvania Inc
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Filing: 1988-12-21
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Granted: 1990-08-14
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Expires: 2008-12-21
Abstract
Abstract A double jacket arc lamp is disclosed. A double jacket arc lamp may be formed with an electric lamp capsule having an inner light transmissive envelope with electrical leads extending from the inner envelope through a first seal, and a second light transmissive envelope sealed to the inner envelope at a second seal to substantially surround the electric lamp capsule and form an enclosed volume between a portion of the exterior of the inner envelope and the interior of the outer envelope, and leaving the leads unenclosed by the outer envelope. The lamp leads then pass through only one seal, and have no portions exposed in the intermediate insulating volume. The intermediate volume of the double jacket arc lamp may include a fill gas including a noninert component. In particular, the fill gas may include oxygen which is thought to have useful gettering and glass preservation attributes. The use of oxygen in the fill gas allows the lamp to operate at a higher temperature, and therefore more efficiently.
Inventors
- 👤 David A. Cox
- 👤 Stephen P. Senft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:08
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A double jacket arc lamp comprising: (a) an electric lamp capsule having an inner light transmissive envelope with electrical leads extending from the inner envelope through a first seal, (b) a second light transmissive envelope sealed to the inner envelope at a second seal to substantially surround the electric lamp capsule and form an enclosed intermediate volume between a portion of the exterior of the inner envelope and the interior of the outer envelope with the leads extending to the exterior of the outer envelope without passing through the intermediate volume, and (c) fill gas in the intermediate volume including an oxygen component.
Claim 2
Dependent Claim
103 words
A double jacket arc lamp comprising: (a) an electric lamp capsule having an inner light transmissive envelope with electrical leads extending from the inner envelope through a first seal, (b) a second light transmissive envelope sealed to the inner envelope at a second seal to substantially surround the electric lamp capsule and form an enclosed intermediate volume between a portion of the exterior of the inner envelope and the interior of the outer envelope with the leads extending to the exterior of the outer envelope without passing through the intermediate volume, and (c) fill gas in the intermediate volume including an oxygen component.
Claim 3
Dependent Claim
13 words
The apparatus in claim 1, wherein the fill gas component is pure oxygen.
Claim 4
Dependent Claim
19 words
The apparatus as in claim 1, wherein the fill gas includes a combination of oxygen and an inert gas.
Claim 5
Dependent Claim
14 words
The apparatus in claim 3, wherein the inert gas combined with oxygen is xenon.
Claim 6
Dependent Claim
19 words
The apparatus of claim 1, wherein the fill gas has a pressure less than atmospheric pressure at normal temperature.
Claim 7
Dependent Claim
20 words
The apparatus of claim 5, wherein the fill gas has a pressure less of approximately 160 torr at normal temperature.
Claim 8
Dependent Claim
120 words
A double jacket arc lamp comprising: (a) an electric lamp capsule having an inner light transmissive envelope with electrical leads extending from the inner envelope through a first seal, (b) a second light transmissive envelope sealed to the inner envelope at a second seal to substantially surround the electric lamp capsule and form an enclosed intermediate volume between a portion of the exterior of the inner envelope and the interior of the outer envelope with the leads extending to the exterior of the outer envelope without passing through the intermediate volume, and (c) a fill gas in the intermediate volume including a combination of oxygen and an inert gas with a pressure less than approximately 160 torr at normal temperature.
Claim 9
Dependent Claim
120 words
A double jacket arc lamp comprising: (a) an electric lamp capsule having an inner light transmissive envelope with electrical leads extending from the inner envelope through a first seal, (b) a second light transmissive envelope sealed to the inner envelope at a second seal to substantially surround the electric lamp capsule and form an enclosed intermediate volume between a portion of the exterior of the inner envelope and the interior of the outer envelope with the leads extending to the exterior of the outer envelope without passing through the intermediate volume, and (c) a fill gas in the intermediate volume including a combination of oxygen and an inert gas with a pressure less than approximately 160 torr at normal temperature.
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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |