Patent US2498381A successfully refreshed from Google Patents.
US2498381A
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US
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Radio echo distance measuring device
Assignee: RCA Corp
•
Filing: 1939-04-12
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Granted: 1950-02-21
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Expires: 1959-04-12
Abstract
No abstract record available.
Inventors
- 👤 Rogers M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:11
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)
US2009459A
Cited
US1924174A
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US1979225A
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US1982271A
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US1993326A
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US2055883A
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US2167492A
Cited
US2143035A
Cited
US2153760A
Cited
US2407198A
Cited
US2403622A
Cited
US2329570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |