Patent US3173134A successfully refreshed from Google Patents.
US3173134A
Expired / Lapsed
US
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Circuit network for electromagnetic transducer heads
Assignee: Olympia Werke AG
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Filing: 1962-04-27
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Granted: 1965-03-09
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Expires: 1982-04-27
Abstract
No abstract record available.
Inventors
- 👤 Petermann Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
CIRCUIT NETWORK FOR MAGNETIC TRANSDUCER HEADS TO BE USED FOR READ-IN AND READ-OUT, THE COMBINATION COMPRISING: AN ENERGIZING COIL FOR THE TRANSDUCER HEAD; A READ-IN TRANSFORMER HAVING ITS SECONDARY WINDING DIRECTLY CONNECTED TO SAID COIL; A READ-OUT TRANSFORMER HAVING THE OPPOSITE ENDS OF ITS PRIMARY WINDING CONNECTED TO SAID COIL VIA THE EMITTER-COLLECTOR PATHS OF TRANSISTORS, THERE BEING TWO COMPLEMENTARY TRANSISTORS IN SERIES BETWEEN SAID COIL AND EACH END OF SAID PRIMARY WINDING; AND MEANS FOR APPLYINF BIASING VOLTAGES TO THE BASE ELECTRODES OF ALL OF THE TRANSISTORS FOR SELECTIVELY BIASING THE TRANSISTORS TO CUT-OFF AND CONDUCTION.
Claim 2
Dependent Claim
97 words
CIRCUIT NETWORK FOR MAGNETIC TRANSDUCER HEADS TO BE USED FOR READ-IN AND READ-OUT, THE COMBINATION COMPRISING: AN ENERGIZING COIL FOR THE TRANSDUCER HEAD; A READ-IN TRANSFORMER HAVING ITS SECONDARY WINDING DIRECTLY CONNECTED TO SAID COIL; A READ-OUT TRANSFORMER HAVING THE OPPOSITE ENDS OF ITS PRIMARY WINDING CONNECTED TO SAID COIL VIA THE EMITTER-COLLECTOR PATHS OF TRANSISTORS, THERE BEING TWO COMPLEMENTARY TRANSISTORS IN SERIES BETWEEN SAID COIL AND EACH END OF SAID PRIMARY WINDING; AND MEANS FOR APPLYINF BIASING VOLTAGES TO THE BASE ELECTRODES OF ALL OF THE TRANSISTORS FOR SELECTIVELY BIASING THE TRANSISTORS TO CUT-OFF AND CONDUCTION.
References Cited (Backward Citations)
US3115621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |