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US2423023A
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Obstacle detection by radio waves
Assignee: RCA Corp
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Filing: 1938-09-30
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Granted: 1947-06-24
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Expires: 1958-09-30
Abstract
No abstract record available.
Inventors
- 👤 William D Hershberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:37
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924156A
Cited
US1982271A
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US1945952A
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US2055883A
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US2116717A
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US2193361A
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US2134716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |