US3371290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field effect transistor product modulator
Assignee: AT&T Inc
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Filing: 1965-04-30
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Granted: 1968-02-27
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Lynden U Kibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:29
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/542; H03C1/547; H03D; H03D1/00; H03D1/22; H03D1/2272
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
APPARATUS FOR SHIFTING THE FREQUENCY SPECTRUM OF A GIVEN SIGNAL TO A DIFFERENT FREQUENCY RANGE COMPRISING FIRST AND SECOND TETRODE FIELD EFFECT DEVICES EACH HAVING A SOURCE CONNECTION, A DRAIN CONNECTION, AND FIRST AND SECOND GATE CONNECTIONS; MEANS FOR APPLYING A CARRIER WAVE TO ONE OF THE GATES OF EACH OF SAID DEVICES; MEANS FOR APPLYING SAID WHEN SIGNAL TO THE OTHER OF THE GATES OF EACH OF SAID DEVICES; MEANS FOR MAINTAINING SAID SOURCE CONNECTIONS AT A COMMON REFERENCE POTENTIAL; AND MEANS FOR EXTRACTING AN OUTER SIGNAL ACROSS SAID DRAINS.
Claim 2
Dependent Claim
91 words
APPARATUS FOR SHIFTING THE FREQUENCY SPECTRUM OF A GIVEN SIGNAL TO A DIFFERENT FREQUENCY RANGE COMPRISING FIRST AND SECOND TETRODE FIELD EFFECT DEVICES EACH HAVING A SOURCE CONNECTION, A DRAIN CONNECTION, AND FIRST AND SECOND GATE CONNECTIONS; MEANS FOR APPLYING A CARRIER WAVE TO ONE OF THE GATES OF EACH OF SAID DEVICES; MEANS FOR APPLYING SAID WHEN SIGNAL TO THE OTHER OF THE GATES OF EACH OF SAID DEVICES; MEANS FOR MAINTAINING SAID SOURCE CONNECTIONS AT A COMMON REFERENCE POTENTIAL; AND MEANS FOR EXTRACTING AN OUTER SIGNAL ACROSS SAID DRAINS.
References Cited (Backward Citations)
US3075090A
Cited
US3204160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |