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Patent US4245155A successfully refreshed from Google Patents.
US4245155A
Expired / Lapsed
US
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Pulsed cesium discharge light source
Assignee: General Electric Co
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Filing: 1978-12-22
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Granted: 1981-01-13
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Expires: 1998-12-22
Abstract
Abstract A metal vapor discharge lamp includes a cathode comprising a reservoir of liquid cesium. Metallic cesium which is eroded from the cathode surface by the action of the discharge is returned to the reservoir by the combined effects of gravity, evaporation, condensation, and diffusion to provide a highly stable, long-lived lamp. The intense infrared pulse output of cesium vapor discharge lamps of the present invention is well suited for triggering light-activated semiconductor switches through dielectric pipe networks and for pumping neodymium glass or neodymium-YAG lasers.
Inventors
- 👤 Harald L. Witting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:54
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18; H01J61/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
In combination: a cesium vapor discharge lamp including a solid metal anode and a cathode comprising a reservoir of liquid cesium; a plurality of light-activated semiconductor switching elements; and means for transmitting radiation emitted from said cesium vapor discharge lamp to light-sensitive areas of said semiconductor switching elements.
Claim 2
Dependent Claim
48 words
In combination: a cesium vapor discharge lamp including a solid metal anode and a cathode comprising a reservoir of liquid cesium; a plurality of light-activated semiconductor switching elements; and means for transmitting radiation emitted from said cesium vapor discharge lamp to light-sensitive areas of said semiconductor switching elements.
Claim 3
Dependent Claim
28 words
The combination of claim 1 wherein the means for transmitting include dielectric means which function to prevent undesired electric current flow between said plurality of semiconductor switching elements.
Claim 4
Dependent Claim
14 words
The combination of claim 1 wherein said means for transmitting include dielectric light pipes.
Claim 5
Dependent Claim
13 words
The combination of claim 3 wherein said light pipes include fiber optic elements.
Claim 6
Dependent Claim
22 words
The combination of claim 3 wherein said means for transmitting further include optical elements for focusing said radiation into said light pipes.
Claim 7
Dependent Claim
13 words
The combination of claim 1 wherein said semiconductor switching elements comprise light-activated thyristors.
Claim 8
Dependent Claim
28 words
The combination of claim 1 wherein said discharge lamp further includes metallic cesium vapor at a pressure of approximately 40 torr disposed between said anode and said cathode.
Claim 9
Dependent Claim
23 words
The combination of claim 1 wherein said cesium vapor discharge lamp further includes an inert gas disposed between said anode and said cathode.
Claim 10
Dependent Claim
46 words
The lamp of claim 1 further including power supply means which function to produce a pulsed electric current flow between said cathode and said anode and which further function to superimpose a direct current flow on said pulsed current flow between said cathode and said anode.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |