US2874077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathodes
Assignee: Rauland Borg Corp
•
Filing: 1957-10-23
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Granted: 1959-02-17
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Expires: 1977-10-23
Abstract
No abstract record available.
Inventors
- 👤 Perry R Joseph
- 👤 Constantin S Szegho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:47
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD OF PROCESSING A CARBONATE COATED CATHODE BY UTILIZING A METALLIC ELEMENT HAVING A METLTING TEMPERATURE HIGHER THAN THE NORMAL OPERATING TEMPERATURE OF SAID CATHODE COMPRISING THE FOLLOWING STEPS IN THE PRESENCE OF AN INERT ATMOSPHERE: HEATING SAID CATHODE TO A PREDETERMINED TEMPERATURE OF THE SAME ORDER OF MAGNITUDE AS SAID NORMAL OPERATING TEMPERATURE TO REDUCE SAID CARBONATE COATING TO AN OXIDE COATNG; EVAPORATING PARTICLES OF METAL FROM SAID METALIC ELEMENT ONTO THE OXIDE COATING OF SAID CATHODE FOR A PREDETERMINED TIME WHILE MAINTAINING SAID CATHODE AT A TEMPERATURE AT LEAST EQUAL TO SAID NORMAL OPERATING TEMPERATURE TO SINTER SAID PARTICLES THEREON; AND THEREAFTER MAINTAINING SAID CATHODE AT A TEMPERATURE AT LEAST EQUAL TO SAID NORMAL OPERATING TEMPERATURE FOR A PREDETERMINED TIME TO STABLIZE SAID METALSINTERD OXIDE COATING.
Claim 2
Independent Claim
129 words
A METHOD OF PROCESSING A CARBONATE COATED CATHODE BY UTILIZING A METALLIC ELEMENT HAVING A METLTING TEMPERATURE HIGHER THAN THE NORMAL OPERATING TEMPERATURE OF SAID CATHODE COMPRISING THE FOLLOWING STEPS IN THE PRESENCE OF AN INERT ATMOSPHERE: HEATING SAID CATHODE TO A PREDETERMINED TEMPERATURE OF THE SAME ORDER OF MAGNITUDE AS SAID NORMAL OPERATING TEMPERATURE TO REDUCE SAID CARBONATE COATING TO AN OXIDE COATNG; EVAPORATING PARTICLES OF METAL FROM SAID METALIC ELEMENT ONTO THE OXIDE COATING OF SAID CATHODE FOR A PREDETERMINED TIME WHILE MAINTAINING SAID CATHODE AT A TEMPERATURE AT LEAST EQUAL TO SAID NORMAL OPERATING TEMPERATURE TO SINTER SAID PARTICLES THEREON; AND THEREAFTER MAINTAINING SAID CATHODE AT A TEMPERATURE AT LEAST EQUAL TO SAID NORMAL OPERATING TEMPERATURE FOR A PREDETERMINED TIME TO STABLIZE SAID METALSINTERD OXIDE COATING.
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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) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |