Patent US2845567A successfully refreshed from Google Patents.
US2845567A
Expired / Lapsed
US
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Indirectly heated thermionic cathode
Assignee: TDK Micronas GmbH
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Filing: 1954-02-04
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Granted: 1958-07-29
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Expires: 1974-02-04
Abstract
No abstract record available.
Inventors
- 👤 Richard H Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:47
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2201819A
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US2201817A
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US1863702A
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US1925701A
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US1684104A
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US1965584A
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GB384099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |