Patent US2899301A successfully refreshed from Google Patents.
US2899301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-tantalum-nickel cathodes
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
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Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:25
CPC Classifications
C; C22; C22C; C22C19/00; H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
AN INDIRECTLY-HEATED CATHODE STRUCTURE CHARACTERIZED BY ENHANCED STRENGTH AT CATHODE-OPERATING TEMPERATURES AND BY GOOD EMISSION PROPERTIES AND COMPOSED OF AN ALLOY CONTAINING, BY WEIGHT, 1% TO 5% TUNGSTEN, .05% TO 2% TANTALUM AND THE REMAINDER ESSENTIALLY NICKEL.
Claim 2
Dependent Claim
37 words
AN INDIRECTLY-HEATED CATHODE STRUCTURE CHARACTERIZED BY ENHANCED STRENGTH AT CATHODE-OPERATING TEMPERATURES AND BY GOOD EMISSION PROPERTIES AND COMPOSED OF AN ALLOY CONTAINING, BY WEIGHT, 1% TO 5% TUNGSTEN, .05% TO 2% TANTALUM AND THE REMAINDER ESSENTIALLY NICKEL.
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) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |