US2436907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly heated cathode
Assignee: National Aeronautics and Space Administration
•
Filing: 1945-06-23
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Granted: 1948-03-02
•
Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Russell F Trimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:39
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1889087A
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US1932077A
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US2041286A
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US2057931A
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US1942080A
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US2192753A
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GB424912A
Cited
GB442649A
Cited
AT148796B
Cited
US2421039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |