Patent US2821694A successfully refreshed from Google Patents.
US2821694A
Expired / Lapsed
US
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Doppler controlled gain for echo ranging equipment
Assignee: Individual
•
Filing: 1945-10-29
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Granted: 1958-01-28
•
Expires: 1965-10-29
Abstract
No abstract record available.
Inventors
- 👤 Paul B Sebring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:04
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/523; G01S7/526; G01S7/529; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1667540A
Cited
US2066156A
Cited
GB542634A
Cited
US2405281A
Cited
US2566858A
Cited
US2431854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |