Patent US3158692A successfully refreshed from Google Patents.
US3158692A
Expired / Lapsed
US
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Channel selecting circuit utilizing diode connection means
Assignee: AT&T Inc
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Filing: 1961-09-19
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Granted: 1964-11-24
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Otto F Gerkensmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:39
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02; H04L1/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
A CHANNEL SELECTING CIRCUIT COMPRISING THREE TRANSFORMERS, EACH HAVING A FIRST WINDING ADAPTED TO BE CONNECTED TO A DIFFERENT COMMUNICATION CHANNEL AND EACH HAVING A SECOND WINDING WITH A CENTER TAP THEREON, PAIRS OF TRANSMISSION DIODES CONNECTING SECOND WINDING TERMINALS OF A FIRST TRANSFOMER TO SECOND WINDING TERMINALS OF THE OTHER TRANSFORMERS, RESPECTIVELY, ADDITIONAL MEANS CONNECTING THE SECOND WINDING TERMINALS OF SAID OTHER TRANSFORMERS TO THE SECOND WINDING CENTER TAP OF SAID FIRST TRANSFORMER, AND MEANS APPLYING BIAS CONTROL SIGNALS TO SECOND WINDING CENTER TAPS OF SAID OTHER TRANSFORMERS FOR BIASING THE PAIR OF TRANSMISSION DIODES CONNECTED TO AT LEAST ONE OF SAID OTHER TRANSFORMER SECOND WINDINGS INTO CONDUCTION WHILE AT THE SAME TIME BIASING CORRESPONDING DIODES CONNECTED TO THE REMAINING OTHER TRANSFORMERS TO NONCONDUCTING CONDITIONS.
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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |