Patent US2603836A successfully refreshed from Google Patents.
US3183441A
Expired / Lapsed
US
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Transponder automatic frequency control system
Assignee: Lockheed Martin Corp
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Filing: 1961-07-12
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Granted: 1965-05-11
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Expires: 1981-07-12
Abstract
No abstract record available.
Inventors
- 👤 John P Francis
- 👤 Cova Paul V De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:18
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0723
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A TRANSPONDER COMPRISING A RADIO RECEIVER CONNECTED TO AN ANTENNA TO RECEIVE A PULSED RADIO SIGNAL OF A FIRST FREQUENCY, MEANS TO GENERATE A RADIO SIGNAL OF VARIABLE FREQUENCY FOR TRANSMISSION FROM ANOTHER ANTENNA CONNECTED THERETO, MEANS TO HETERODYNE SAID PULSED AND VARIBLE FREQUENCY SIGNALS IN ORDER TO PRODUCE A DIFFERENCE SIGNAL WHICH IS THE DIFFERENCE BETWEEN SAID PULSED AND VARIABLE FREQUENCY SIGNALS IN ORDER TO PRODUCE A DIFFERENCE DUCE SAID DIFFERENCE SIGNAL, MEANS FOR DERIVING AN OUTPUT PROPORTIONAL TO CHANGES IN SAID DIFFERENCE SIGNAL, MEANS IN RESPONSE T SAID DERIVING MEANS TO PRODUCE A REFERENCE MEANS AND SAID REFERENCE PRODUCING MEANS, GENERATING MEANS AND SAID REFERENCE PRODUCING MEANS, MEANS CONNECTED TO THE OUTPUT OF SAID AMPLIFYING MEANS HAVING AN OUTPUT PROPORTIONAL TO THE MODULATION OF SAID DIFFERENCE SIGNAL, GATINGH MEANS CONNECTED TO SAID PROPORTIONAL MEANS AND BEING OPERATIVE TO PLACE SAID AMPLIFIER IN ALTERNATIVE OPERATIVE AND INOPERATIVE STATES, MEANS RESPONSIVE TO THE PROPORTIONAL MEANS FOR APPLYING AN AMPLIFIED SWEEP SIGNAL TO BOTH SAID GENERATING MEANS AND TO SAID INTERCONNECTING MEANS, SAID INTERCONNECTING MEANS HAVING AN OUTPUT PRESENT ONLY WHEN SAID AMPLIFIER IS IN SAID INOPERATIVE STATE, SAID OUTPUT OF THE INTERCONNECTING MEANS BEING OF SAID FIRST FREQUENCY.
Claim 2
Dependent Claim
198 words
A TRANSPONDER COMPRISING A RADIO RECEIVER CONNECTED TO AN ANTENNA TO RECEIVE A PULSED RADIO SIGNAL OF A FIRST FREQUENCY, MEANS TO GENERATE A RADIO SIGNAL OF VARIABLE FREQUENCY FOR TRANSMISSION FROM ANOTHER ANTENNA CONNECTED THERETO, MEANS TO HETERODYNE SAID PULSED AND VARIBLE FREQUENCY SIGNALS IN ORDER TO PRODUCE A DIFFERENCE SIGNAL WHICH IS THE DIFFERENCE BETWEEN SAID PULSED AND VARIABLE FREQUENCY SIGNALS IN ORDER TO PRODUCE A DIFFERENCE DUCE SAID DIFFERENCE SIGNAL, MEANS FOR DERIVING AN OUTPUT PROPORTIONAL TO CHANGES IN SAID DIFFERENCE SIGNAL, MEANS IN RESPONSE T SAID DERIVING MEANS TO PRODUCE A REFERENCE MEANS AND SAID REFERENCE PRODUCING MEANS, GENERATING MEANS AND SAID REFERENCE PRODUCING MEANS, MEANS CONNECTED TO THE OUTPUT OF SAID AMPLIFYING MEANS HAVING AN OUTPUT PROPORTIONAL TO THE MODULATION OF SAID DIFFERENCE SIGNAL, GATINGH MEANS CONNECTED TO SAID PROPORTIONAL MEANS AND BEING OPERATIVE TO PLACE SAID AMPLIFIER IN ALTERNATIVE OPERATIVE AND INOPERATIVE STATES, MEANS RESPONSIVE TO THE PROPORTIONAL MEANS FOR APPLYING AN AMPLIFIED SWEEP SIGNAL TO BOTH SAID GENERATING MEANS AND TO SAID INTERCONNECTING MEANS, SAID INTERCONNECTING MEANS HAVING AN OUTPUT PRESENT ONLY WHEN SAID AMPLIFIER IS IN SAID INOPERATIVE STATE, SAID OUTPUT OF THE INTERCONNECTING MEANS BEING OF SAID FIRST FREQUENCY.
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) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |