US2775757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary indicator for radio-echo detection system
Assignee: Individual
•
Filing: 1943-11-19
•
Granted: 1956-12-25
•
Expires: 1963-11-19
Abstract
No abstract record available.
Inventors
- 👤 Louis D Ellsworth
- 👤 Chalmers W Sherwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:59
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/10; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/42; G01S7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2121359A
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US2231929A
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US2241809A
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GB520778A
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US2405238A
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US2312761A
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US2408415A
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US2429809A
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US2355363A
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US2395966A
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US2421747A
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US2401432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |