US4275330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge lamp having a cathode with cesium metal oxide
Assignee: General Electric Co
•
Filing: 1979-03-08
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Granted: 1981-06-23
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Expires: 1999-03-08
Abstract
Abstract A discharge type electric lamp construction is described having electrode means which include a porous sintered body of refractory metal having an electron emissive material containing cesium ion dispersed in the pores of said porous sintered body as Cs 2 MO 4 wherein M is a refractory metal. Said electron emissive material is preferably employed in combination with another electron emissive material containing barium ions to provide a lower breakdown voltage as well as operating voltage characteristics for said discharge lamps. Representative electron emissive materials containing barium ions include barium aluminate and barium tungstate materials.
Inventors
- 👤 Chong I. Cho
- 👤 Edward C. Zukowski
- 👤 Dimitri M. Speros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:16
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677; H01J61/70; H01J61/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
A cathode comprising a porous sintered body of refractory metal and a first electron emissive material selected from barium aluminate and barium tungstate, said cathode having Cs 2 MO 4 as a second electron emissive material dispersed in the pores of said porous sintered body and wherein M is a refractory metal.
Claim 2
Dependent Claim
52 words
A cathode comprising a porous sintered body of refractory metal and a first electron emissive material selected from barium aluminate and barium tungstate, said cathode having Cs 2 MO 4 as a second electron emissive material dispersed in the pores of said porous sintered body and wherein M is a refractory metal.
Claim 3
Dependent Claim
17 words
A cathode as in claim 1 wherein the refractory metal of said porous sintered body is tungsten.
Claim 4
Dependent Claim
10 words
A cathode as in claim 1 wherein M is tantalum.
Claim 5
Dependent Claim
84 words
An electric discharge lamp comprising a transparent envelope containing a pair of spaced apart discharge electrodes hermetically sealed within said envelope and an ionizable atmosphere within said envelope, at least one of said electrodes comprising a porous sintered body of refractory metal and a first electron emissive material selected from barium aluminate and barium tungstate, said cathode having Cs 2 MO 4 as a second electron emissive material dispersed in the pores of said porous sintered body and wherein M is a refractory metal.
Claim 6
Dependent Claim
84 words
An electric discharge lamp comprising a transparent envelope containing a pair of spaced apart discharge electrodes hermetically sealed within said envelope and an ionizable atmosphere within said envelope, at least one of said electrodes comprising a porous sintered body of refractory metal and a first electron emissive material selected from barium aluminate and barium tungstate, said cathode having Cs 2 MO 4 as a second electron emissive material dispersed in the pores of said porous sintered body and wherein M is a refractory metal.
Claim 7
Dependent Claim
28 words
An electric discharge lamp as in claim 4 wherein the transparent enevelope is a glass tube and the electrodes are sealed at each end of said glass tube.
Claim 8
Dependent Claim
14 words
An electric discharge lamp as in claim 5 wherein both electrodes are the same.
Claim 9
Dependent Claim
19 words
An electric discharge lamp as in claim 5 wherein the refractory metal of said porous sintered body is tungsten.
Claim 10
Dependent Claim
12 words
An electric discharge lamp as in claim 4 wherein M is tantalum.
Claim 11
Dependent Claim
19 words
A photographic flash tube having the lamp configuration of claim 4 and wherein the ionizable atmosphere is xenon gas.
References Cited (Backward Citations)
US2871196A
Cited
US2957231A
Cited
US3283195A
Cited
US3467878A
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US3758184A
Cited
US3708710A
Cited
US3798492A
Cited
US3758809A
Cited
US3906271A
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US4097762A
Cited
US4152620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |