Patent US2716716A successfully refreshed from Google Patents.
US2716716A
Expired / Lapsed
US
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Cathode containing a supply of an electron-emissive material
Assignee: US Philips Corp
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Filing: 1951-11-29
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Granted: 1955-08-30
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Expires: 1971-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ray C Hughes
- 👤 Patrick P Coppola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:53
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/10; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A DISPENSER TYPE CATHODE COMPRISING A BODY OF SINTERED TUNGSTEN HAVING A POROUS PORTION, AND A SUPPLY OF AN ELECTRON-EMISSIVE MATERIAL CONSISTING OF AN ALKALINE EARTH AZIDE AND AN ALKALINE EARTH FORMATE DISPOSED WITHIN SAID BODY, SAID ELECTRON-EMISSIVE MATERIAL BEING REACTABLE BY HEAT TO FORM THE CORRESPONDING ALKALINE-EARTH OXIDE WITHOUT FORMING PRODUCTS WHICH OXIDIZE THE TUNGSTEN.
Claim 2
Dependent Claim
56 words
A DISPENSER TYPE CATHODE COMPRISING A BODY OF SINTERED TUNGSTEN HAVING A POROUS PORTION, AND A SUPPLY OF AN ELECTRON-EMISSIVE MATERIAL CONSISTING OF AN ALKALINE EARTH AZIDE AND AN ALKALINE EARTH FORMATE DISPOSED WITHIN SAID BODY, SAID ELECTRON-EMISSIVE MATERIAL BEING REACTABLE BY HEAT TO FORM THE CORRESPONDING ALKALINE-EARTH OXIDE WITHOUT FORMING PRODUCTS WHICH OXIDIZE THE TUNGSTEN.
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) | 1958-08-29 | 1959-02-28 | 1959-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-29 | 1963-02-28 | 1963-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-29 | 1967-02-28 | 1967-08-30 | $7700.00 | Window Closed / Lapsed |