Patent US3159461A successfully refreshed from Google Patents.
US3159461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode
Assignee: AT&T Inc
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Filing: 1958-10-20
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Granted: 1964-12-01
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Macnair Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:52
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/20; H01J1/28; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/937; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12118; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A CATHODE ELEMENT COMPRISING A METALLIC BODY MEMBER, A MOLDED ELEMENT CONSISTING ESSENTIALLY OF A SINTERED MASS OF METALLIC POWDER, AT LEAST ONE ALKALINE EARTH OXIDE INCLUDING BARIUM OXIDE AND AN ACTIVATOR MATERIAL THEREFOR, AND AN EMISSIVE COATING CONSISTING ESSENTIALLY OF AT LEAST ONE ALKALINE EARTH OXIDE INCLUDING BARIUM OXIDE, THE AR-
Claim 2
Dependent Claim
52 words
A CATHODE ELEMENT COMPRISING A METALLIC BODY MEMBER, A MOLDED ELEMENT CONSISTING ESSENTIALLY OF A SINTERED MASS OF METALLIC POWDER, AT LEAST ONE ALKALINE EARTH OXIDE INCLUDING BARIUM OXIDE AND AN ACTIVATOR MATERIAL THEREFOR, AND AN EMISSIVE COATING CONSISTING ESSENTIALLY OF AT LEAST ONE ALKALINE EARTH OXIDE INCLUDING BARIUM OXIDE, THE AR-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |