Patent US4320630A successfully refreshed from Google Patents.
Patent US3114881A successfully refreshed from Google Patents.
US3114881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heterodyne receiver
Assignee: AT&T Inc
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Filing: 1960-03-17
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Granted: 1963-12-17
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Expires: 1980-03-17
Abstract
No abstract record available.
Inventors
- 👤 Uenohara Michiyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:13
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0616
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A COMBINATION AMPLIFIER AND SUBHARMONIC GENERATOR COMPRISING A PLURALITY OF RESONANTLY TUNED CIRCUITS HAVING A COMMON VARIABLE REACTIVE MEMBER, SAID CIRCUITS HAVING AN ADMITTANCE VARIATION WITH RESPECT TO FREQUENCY WHICH HAS A FIRST MINIMUM AT A FIRST FREQUENCY FS, A SECOND MINIMUM AT A SECOND FREQUENCY FI, AND A THIRD MINIMUM AT A THIRD FREQUENCY FP/2, MEANS FOR COUPLING A SIGNAL AT FREQUENCY FS TO ONE OF SAID TUNED CIRCUITS, MEANS FOR COUPLING A PUMPING SIGNAL AT A FREQUENCY FP TO SAID COMMON MEMBER, AND MEANS FOR SIMULTANEOUSLY EXTRACTING FROM SAID TUNED CIRCUITS AN AMPLIFIED SIGNAL AT FREQUENCY FS AND A SUBHARMONIC OF SAID PUMPING SIGNAL AT FREQUENCY FP/2.
Claim 2
Dependent Claim
109 words
A COMBINATION AMPLIFIER AND SUBHARMONIC GENERATOR COMPRISING A PLURALITY OF RESONANTLY TUNED CIRCUITS HAVING A COMMON VARIABLE REACTIVE MEMBER, SAID CIRCUITS HAVING AN ADMITTANCE VARIATION WITH RESPECT TO FREQUENCY WHICH HAS A FIRST MINIMUM AT A FIRST FREQUENCY FS, A SECOND MINIMUM AT A SECOND FREQUENCY FI, AND A THIRD MINIMUM AT A THIRD FREQUENCY FP/2, MEANS FOR COUPLING A SIGNAL AT FREQUENCY FS TO ONE OF SAID TUNED CIRCUITS, MEANS FOR COUPLING A PUMPING SIGNAL AT A FREQUENCY FP TO SAID COMMON MEMBER, AND MEANS FOR SIMULTANEOUSLY EXTRACTING FROM SAID TUNED CIRCUITS AN AMPLIFIED SIGNAL AT FREQUENCY FS AND A SUBHARMONIC OF SAID PUMPING SIGNAL AT FREQUENCY FP/2.
References Cited (Backward Citations)
US2712062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |