US2769708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode and method of making the same
Assignee: US Philips Corp
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Filing: 1953-06-11
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Granted: 1956-11-06
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Expires: 1973-06-11
Abstract
No abstract record available.
Inventors
- 👤 Patrick P Coppola
- 👤 Ray C Hughes
- 👤 Otto G Koppius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF MAKING A THERMIONIC DISPENSER CATHODE COMPRISING THE STEPS OF MIXING ABOUT 90% BY WEIGHT OF A POWDERED REGRACTORY METAL AND ABOUT 10% BY WEIGHT OF A POWDERED FUSED MIXTURE OF AT LEAST ABOUT 60% BY WEIGHT OF AN ALKALINE EARTH METAL OXIDE AND THE REMAINDER PRINCIPALLY ALLUMINUM OXIDE, PRESSING SAID MIXTURE INTO A BODY, AND FIRING SAID BODY AT A TEMPERATURE OF ABOUT 1650* TO 1750* C. FOR ABOUT ONE-HALF MINUTE TO FROM A COHERENT COMPOSITE MASS OF THE REFRACTORY METAL AND SAID FUSED MIXTURE FREE OF ENTRAINED GAS.
Claim 2
Independent Claim
92 words
A METHOD OF MAKING A THERMIONIC DISPENSER CATHODE COMPRISING THE STEPS OF MIXING ABOUT 90% BY WEIGHT OF A POWDERED REGRACTORY METAL AND ABOUT 10% BY WEIGHT OF A POWDERED FUSED MIXTURE OF AT LEAST ABOUT 60% BY WEIGHT OF AN ALKALINE EARTH METAL OXIDE AND THE REMAINDER PRINCIPALLY ALLUMINUM OXIDE, PRESSING SAID MIXTURE INTO A BODY, AND FIRING SAID BODY AT A TEMPERATURE OF ABOUT 1650* TO 1750* C. FOR ABOUT ONE-HALF MINUTE TO FROM A COHERENT COMPOSITE MASS OF THE REFRACTORY METAL AND SAID FUSED MIXTURE FREE OF ENTRAINED GAS.
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |