US2475644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube
Assignee: NORA A WOODIN
•
Filing: 1943-08-19
•
Granted: 1949-07-12
•
Expires: 1963-08-19
Abstract
No abstract record available.
Inventors
- 👤 Soller Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:36
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2096653A
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GB467106A
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US2103507A
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US2202511A
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US2190069A
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US2157585A
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US2287296A
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US2250528A
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US2257795A
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US2254036A
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US2293417A
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US2368329A
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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) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |