Patent US3553697A successfully refreshed from Google Patents.
US3553697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel combiner system for sequentially received phase signals
Assignee: United States Department of the Navy
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Filing: 1968-04-30
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Granted: 1971-01-05
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Expires: 1988-04-30
Abstract
Abstract A RADIO INTERFEROMETER SYSTEM FOR DETECTING AND COMBINING PHASE DIFFERENCES OF SEQUENTIAL SIGNALS ARRIVING FROM A MOVING TARGET. THE SIGNALS OF VARIOUS FREQUENCIES ARE RECEIVED BY A PAIR OF SPACED ANTENNAS AND TEMPORARILY STORED. PHASE ERRORS IN THESE SIGNALS, DUE TO THE CHANGING LOCATION OF THE TARGET, ARE COMPENSATED FOR BY WEIGHTEDLY ADDING PLURAL A.C. SIGNALS RECEIVED AT DIFFERENT TIMES TO OBTAIN RESULTANT SIGNALS WHOSE PHASES CORRESPOND TO THAT OF SIGNALS STARTING SIMULTANEOUSLY FROM THE TARGET.
Inventors
- 👤 Maxime G Kaufman
- 👤 Kenneth E Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:42
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |