Patent US3120000A successfully refreshed from Google Patents.
US3120000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finding systems
Assignee: Individual
•
Filing: 1961-07-27
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Granted: 1964-01-28
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Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond M Wilmotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:49
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/583; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
DIRECTION FINDING APPARATUS COMPRISING A PLURALITY OF SPACED ANTENNAS, AN ADDER CIRCUIT FOR ADDITIVELY COMBINING THE SIGNALS RECEIVED BY SAID ANTENNAS, SPECTRUM ANALYZING MEANS CONNECTED TO SAID LAST-NAMED MEANS FOR DETERMINING THE NUMBER OF MAXIMA AND MINIMA IN THE FREQUENCY SPECTRUM OF THE ADDITIVELY COMBINED SIGNALS, AND MEANS RESPONSIVE TO SAID SPECTRUM ANALYZING MEANS FOR DETERMINING THE DIRECTION OF ONE OR MORE TARGETS IN ACCORDANCE WITH THE DISTRIBUTION OF SAID MAXIMA AND MINIMA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |