Patent US2858207A successfully refreshed from Google Patents.
US2858207A
Expired / Lapsed
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Thermionic cathode cores composed of nickel-rhenium alloy
Assignee: CHARLES BERTOLUS Ets
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Filing: 1955-12-22
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Granted: 1958-10-28
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Expires: 1975-12-22
Abstract
No abstract record available.
Inventors
- 👤 Maurice P Warin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:51
CPC Classifications
C; C22; C22C; C22C19/00; H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22; H01J1/26; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
AN ELECTRICALLY CONDUCTIVE CORE FOR A THERMIONICALLY ACTIVE CATHODE HAVING AN ALKALINE EARTH OXIDE COATING
Claim 2
Dependent Claim
15 words
AN ELECTRICALLY CONDUCTIVE CORE FOR A THERMIONICALLY ACTIVE CATHODE HAVING AN ALKALINE EARTH OXIDE COATING
References Cited (Backward Citations)
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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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |