Patent US2885334A successfully refreshed from Google Patents.
US2885334A
Expired / Lapsed
US
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Thermionic cathode heaters
Assignee: International Standard Electric Corp
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Filing: 1954-12-28
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Granted: 1959-05-05
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Expires: 1974-12-28
Abstract
No abstract record available.
Inventors
- 👤 Green Bernard Jeffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:15
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/02; H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22; H01J9/00; H01J9/02; H01J9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF MANUFACTURE OF A THERMIONIC CATHODE COMPRISING THE STEPS OF ELECTROPHORETICALLY COATING THE CATHODE HEATER WITH ALUMINA FROM A BATH CONTAINING EIGHT PARTS BY WEIGHT OF 2 ALUMINA, WHEREBY THE RETO TWELVE PARTS OF A ALUMINA DRYING THE COATING, HEATING THE COATING BETWEEN 800*-1000* C, FOR CONVERSION OF THE V ALUMINA ULTIMATELY INTO A ALUMINA , WHEREBY THE RESULTANT MIXTURE HAS AN INCREASED SPECIFIC GRAVITY WHICH CAUSES A VOLUME SHRINKAGE OF THE COATING AND CRAZING THEREOF WITH SMALL FISSURES.
Claim 2
Independent Claim
81 words
THE METHOD OF MANUFACTURE OF A THERMIONIC CATHODE COMPRISING THE STEPS OF ELECTROPHORETICALLY COATING THE CATHODE HEATER WITH ALUMINA FROM A BATH CONTAINING EIGHT PARTS BY WEIGHT OF 2 ALUMINA, WHEREBY THE RETO TWELVE PARTS OF A ALUMINA DRYING THE COATING, HEATING THE COATING BETWEEN 800*-1000* C, FOR CONVERSION OF THE V ALUMINA ULTIMATELY INTO A ALUMINA , WHEREBY THE RESULTANT MIXTURE HAS AN INCREASED SPECIFIC GRAVITY WHICH CAUSES A VOLUME SHRINKAGE OF THE COATING AND CRAZING THEREOF WITH SMALL FISSURES.
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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |