Patent US2885665A successfully refreshed from Google Patents.
US2885665A
Expired / Lapsed
US
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Pulse echo recognition systems
Assignee: RCA Corp
•
Filing: 1941-05-29
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Granted: 1959-05-05
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Expires: 1961-05-29
Abstract
No abstract record available.
Inventors
- 👤 Wolff Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:44
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)
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US2013594A
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US2142648A
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US2144337A
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GB480572A
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US2207267A
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US2189549A
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US2252083A
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US2433838A
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US2423644A
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US2423082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |