US4295074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury arc lamp having communicating mercury reservoir
Assignee: RCA Licensing Corp
•
Filing: 1979-03-21
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Granted: 1981-10-13
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Expires: 1999-03-21
Abstract
Abstract A mercury arc lamp envelope has a first internal bore including a pair of spaced apart regions with lead-in conductors terminating in electrodes, said conductors being sealed in said envelope and extending through said regions. Pools of mercury are retained within the regions and around the electrodes. At least one chamber, having a reservoir of mercury, communicates through a second internal bore with one of the regions. The chamber is remote from the regions.
Inventors
- 👤 Frank R. Ragland, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:57
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/70; G03F7/70008; G03F7/70016; H; H01; H01J; H01J61/00; H01J61/02; H01J61/24; H01J61/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
In a high pressure mercury discharge device including an envelope having a first internal bore including a pair of spaced apart regions, said envelope having lead-in conductors terminating in electrodes, said conductors being sealed in said envelope and extending through said regions, and having pools of mercury retained within said regions around said electrodes, the improvement comprising at least one chamber having a reservoir of mercury therein, and a second integral bore communicating between said chamber and one of said regions, said chamber being substantially larger than second integral bore, said chamber being remote from said regions whereby said chamber can be selectively heated or cooled independently of said regions to vary the impedance of said device.
Claim 2
Dependent Claim
117 words
In a high pressure mercury discharge device including an envelope having a first internal bore including a pair of spaced apart regions, said envelope having lead-in conductors terminating in electrodes, said conductors being sealed in said envelope and extending through said regions, and having pools of mercury retained within said regions around said electrodes, the improvement comprising at least one chamber having a reservoir of mercury therein, and a second integral bore communicating between said chamber and one of said regions, said chamber being substantially larger than second integral bore, said chamber being remote from said regions whereby said chamber can be selectively heated or cooled independently of said regions to vary the impedance of said device.
Claim 3
Dependent Claim
21 words
The high pressure mercury discharge device as described in claim 1 wherein said chamber has a diameter larger than said regions.
Claim 4
Dependent Claim
23 words
A high pressure mercury discharge device as described in claim 2 wherein said second bore has a length of at least 5 mm.
Claim 5
Dependent Claim
27 words
A high pressure mercury discharge device as described in claim 3 wherein said second bore has a diameter substantially equal to the diameter of said first bore.
Claim 6
Dependent Claim
19 words
A high pressure mercury discharge device as described in claim 4 wherein said chamber is coaxial with said regions.
References Cited (Backward Citations)
US1971939A
Cited
US2307502A
Cited
GB767395A
Cited
US2961564A
Cited
DE1133824B
Cited
US4156826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |