US3312971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar system
Assignee: General Dynamics Corp
•
Filing: 1964-09-30
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Granted: 1967-04-04
•
Expires: 1984-09-30
Abstract
No abstract record available.
Inventors
- 👤 John B Gehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:16
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
A RADAR SYSTEM FOR CONTROLLING THE POSITION OF A PLURALITY OF CRAFT, SAID SYSTEM COMPRISING: (A) A TRANSPONDER INCLUDING A RECEIVER AND A TRANSMITTER IN EACH CRAFT FOR RESPECTIVELY RECEIVING REPLY SIGNALS AND RETRANSMITTING SAID RECEIVED REPLY SIGNALS, (B) ONE OF SAID CRAFT BEING A MASTER CRAFT AND HAVING A SIGNAL SOURCE FOR TRANSMITTING RANGE INTERROGATIONS AND A VARIABLE FREQUENCY SIGNAL GENERATOR FOR TRANSMITTING AZIMUTH SIGNALS WHICH HAVE A CYCLICAL VARIATION IN FREQUENCY CORRESPONDING TO CYCLICAL SCANS IN AZIMUTH, MEANS FOR COUPLING SAID SOURCE AND SAID GENERATOR TO THE TRANSMITTER OF THE MASTER CRAFT TRANSPONDER FOR TRANSMISSION TO THE OTHER OF SAID PLURALITY OF CRAFT, (C) GATE MEANS BETWEEN SAID RECEIVER AND TRANSMITTER IN THE TRANSPONDERS ON SAID OTHER OF SAID PLURALITY OF CRAFT FOR CONTROLLING THE TRANSMISSION OF REPLY SIGNALS TO SAID MASTER CRAFT,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |