US2592777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse-echo identifying system
Assignee: Individual
•
Filing: 1946-08-21
•
Granted: 1952-04-15
•
Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:40
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; H; H03; H03D; H03D11/00; H03D11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2134716A
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US2333688A
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US2252083A
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US2453970A
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US2416346A
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US2421016A
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US2471373A
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US2418139A
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US2419571A
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US2415667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |