US2431139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron
Assignee: Westinghouse Electric Corp
•
Filing: 1943-06-23
•
Granted: 1947-11-18
•
Expires: 1963-06-23
Abstract
No abstract record available.
Inventors
- 👤 Robert C Retherford
- 👤 William L Rast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:19
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1756882A
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US1965338A
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US2052103A
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US2024585A
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US2075855A
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US2130510A
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US2250698A
Cited
US2345642A
Cited
US2411601A
Cited
US2408238A
Cited
US2408239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |