Patent US2413939A successfully refreshed from Google Patents.
US3159790A
Expired / Lapsed
US
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Low noise, multiple mixer system
Assignee: Lockheed Martin Corp
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Filing: 1960-07-18
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Granted: 1964-12-01
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 Pratt Amasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/14; H03D7/1408
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
AN IMPROVED LOW-LEVEL SIGNAL HANDLING PORTION OF A RECEIVING SYSTEM COMPRISING AN ANTENNA, ISOLATOR MEANS CONNECTED TO RECEIVE OUTPUT SIGNALS FROM SAID ANTENNA AND TO DIVIDE THE POWER THEREOF BETWEEN AT LEAST ONE PAIR OF OUTPUT CONNECTIONS, SAID ISOLATOR MEANS BEING DESIGNED TO PREVENT FEEDBACK SIGNALS BETWEEN SAID OUTPUT CONNECTIONS, AT LEAST ONE PAIR OF BALANCED MIXERS EACH INCLUDING A HYBRID WAVEGUIDE SECTION HAVING A PAIR OF UNIDIRECTIONAL CONDUCTING DEVICES CONNECTED IN OPPOSED PHASE RELATION IN THE OUTPUT SECTION THEREOF, MEANS FOR COUPLING SIGNALS PRESENT AT SAID OUTPUT CONNECTIONS TO A RESPECTIVE ONE OF SAID BALANCED MIXERS, A LOCAL OSCILLATOR COUPLED FOR INTRODUCING SIGNALS INTO SAID BALANCED MIXERS FOR PRODUCING INTERMEDIATE-FREQUENCY SIGNALS, A PLURALITY OF CONNECTING
Claim 2
Dependent Claim
116 words
AN IMPROVED LOW-LEVEL SIGNAL HANDLING PORTION OF A RECEIVING SYSTEM COMPRISING AN ANTENNA, ISOLATOR MEANS CONNECTED TO RECEIVE OUTPUT SIGNALS FROM SAID ANTENNA AND TO DIVIDE THE POWER THEREOF BETWEEN AT LEAST ONE PAIR OF OUTPUT CONNECTIONS, SAID ISOLATOR MEANS BEING DESIGNED TO PREVENT FEEDBACK SIGNALS BETWEEN SAID OUTPUT CONNECTIONS, AT LEAST ONE PAIR OF BALANCED MIXERS EACH INCLUDING A HYBRID WAVEGUIDE SECTION HAVING A PAIR OF UNIDIRECTIONAL CONDUCTING DEVICES CONNECTED IN OPPOSED PHASE RELATION IN THE OUTPUT SECTION THEREOF, MEANS FOR COUPLING SIGNALS PRESENT AT SAID OUTPUT CONNECTIONS TO A RESPECTIVE ONE OF SAID BALANCED MIXERS, A LOCAL OSCILLATOR COUPLED FOR INTRODUCING SIGNALS INTO SAID BALANCED MIXERS FOR PRODUCING INTERMEDIATE-FREQUENCY SIGNALS, A PLURALITY OF CONNECTING
References Cited (Backward Citations)
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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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |