US3400294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated cathode and method of manufacture
Assignee: General Electric Co
•
Filing: 1964-12-07
•
Granted: 1968-09-03
•
Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 August J Kling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:40
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1431825A
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US2451297A
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US2577239A
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US2981897A
Cited
US2864968A
Cited
US3226806A
Cited
FR1260743A
Cited
GB898448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |