US2639423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar contrast control system
Assignee: United States, WAR, Secretary of
•
Filing: 1945-08-01
•
Granted: 1953-05-19
•
Expires: 1965-08-01
Abstract
No abstract record available.
Inventors
- 👤 Sherr Rubby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:50
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1960723A
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US2149697A
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US2233275A
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US2498381A
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US2303358A
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US2406316A
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US2449985A
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US2471516A
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US2435960A
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US2403562A
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US2426182A
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US2492120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |