US3188236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodes and method of manufacture
Assignee: General Electric Co
•
Filing: 1959-12-17
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Granted: 1965-06-08
•
Expires: 1979-12-17
Abstract
No abstract record available.
Inventors
- 👤 Dimitrios M Speros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735; H01J61/0737; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J61/067; H01J61/0675; H01J61/0677
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
THE PROCESS OF MAKING AN ACTIVATED ELECTRON EMISSIVE CATHODE WHICH COMPRISES COATING A SUBSTRATE WITH A MIXTURE OF BARIUM THORATE HAVING THE STOICHIOMETRIC FORMULA BAO-THO2 AND HAVING ADDED THORIUM IS POWDERED FORM IN A MOLAR PROPORTION IN THE RANGE OF 0.15 TO 0.25, AND HEATING SAID SUBSTRATE AND COATING TO A RELAITVELY LOW TEMPERATURE IN A NEUTRAL ATMOSPHERE SUFFICIENT TO ALLOW THE SOLID STATE REACTION TO PROCEED TO COMPLETION WHEREBY TO PRODUCE AN ACTIVATED MATERIAL.
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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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |