US3289102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable frequency phase shift oscillator utilizing field-effect transistors
Assignee: AT&T Inc
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Filing: 1965-04-29
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Granted: 1966-11-29
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Expires: 1985-04-29
Abstract
No abstract record available.
Inventors
- 👤 Hayashi Izuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:29
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN A VARIABLE IMPEDANCE CIRCUIT HAVING A PLURALITY OF SIGNAL-CONTROLLED VARIABLE IMPEDANCE ELEMENTS, MEANS FOR STABILIZING SAID VARIABLE IMPEDANCE ELEMENTS AGAINST VARIATIONS IN AMBIENT CONDITIONS COMPRISING A STANDARD VARIABLE IMPEDANCE RELATIVELY INSENSITIVE TO SAID AMBIENT CONDITIONS, CIRCUIT MEANS FOR DETECTING THE DIFFERENCE AND IMPEDANCE BETWEEN SAID STANDARD VARIABLE IMPEDANCE AND ONE OF SAID SIGNAL-CONTROLLED VARIABLE IMPEDANCES AND FOR GENERATING A SIGNAL TO BE APPLIED TO ALL OF SAID SIGNALCONTROLLED VARIABLE IMPEDANCES SO AS TO REDUCE SAID DIFFERENCE.
Claim 2
Dependent Claim
77 words
IN A VARIABLE IMPEDANCE CIRCUIT HAVING A PLURALITY OF SIGNAL-CONTROLLED VARIABLE IMPEDANCE ELEMENTS, MEANS FOR STABILIZING SAID VARIABLE IMPEDANCE ELEMENTS AGAINST VARIATIONS IN AMBIENT CONDITIONS COMPRISING A STANDARD VARIABLE IMPEDANCE RELATIVELY INSENSITIVE TO SAID AMBIENT CONDITIONS, CIRCUIT MEANS FOR DETECTING THE DIFFERENCE AND IMPEDANCE BETWEEN SAID STANDARD VARIABLE IMPEDANCE AND ONE OF SAID SIGNAL-CONTROLLED VARIABLE IMPEDANCES AND FOR GENERATING A SIGNAL TO BE APPLIED TO ALL OF SAID SIGNALCONTROLLED VARIABLE IMPEDANCES SO AS TO REDUCE SAID DIFFERENCE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |