US2453970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recognition system for pulse echo radio locators
Assignee: RCA Corp
•
Filing: 1941-05-31
•
Granted: 1948-11-16
•
Expires: 1961-05-31
Abstract
No abstract record available.
Inventors
- 👤 George M Charrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:23
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1792746A
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US2055883A
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US2134716A
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US2207267A
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US2252083A
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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) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |