US3381098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record bias supply
Assignee: Ampex Corp
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Filing: 1964-11-18
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Granted: 1968-04-30
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Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Evangelos I Pezirtzoglou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A CIRCUIT FOR APPLYING A BIAS SIGNAL AND A RECORD SIGNAL TO THE HEAD OF A MAGNETIC TAPE RECORDER, COMPRISING: A BIAS SIGNAL INPUT TERMINAL, A RECORD SIGNAL INPUT TERMINAL, A MAGNETIC HEAD HAVING WINDINGS, A BIAS TRANSFORMER HAVING A FIRST PRIMARY AND A FIRST SECONDARY, SAID FIRST PRIMARY BEING COUPLED TO RECEIVE BIAS SIGNALS FROM SAID BIAS SIGNAL INPUT TERMINAL, MEANS FOR ELIMINATING ALL SIGNALS OTHER THAN THE BIAS SIGNALS APPEARING ON SAID FIRST PRIMARY, A RECORD SIGNAL OUTPUT TRANSFORMER HAVING A SECOND PRIMARY AND A SECOND SECONDARY, ONE END OF SAID SECOND PRIMARY AND ONE END OF SAID SECOND SECONDARY BEING JOINED, THE OTHER END OF THE SECOND PRIMARY BEING COUPLED TO THE RECORD SIGNAL INPUT TERMINAL, THE OTHER END OF THE SECOND SECONDARY BEING COUPLED TO A FIRST END OF THE FIRST SECONDARY, A SECOND END OF THE FIRST SECONDARY BEING COUPLED TO THE HEAD WINDINGS, AND MEANS COUPLED BETWEEN THE BIAS TRANSFORMER SECONDARY AND THE RECORD SIGNAL TRANSFORMER SECONDARY FOR SHUNTING THE BIAS SIGNAL TO GROUND.
Claim 2
Dependent Claim
170 words
A CIRCUIT FOR APPLYING A BIAS SIGNAL AND A RECORD SIGNAL TO THE HEAD OF A MAGNETIC TAPE RECORDER, COMPRISING: A BIAS SIGNAL INPUT TERMINAL, A RECORD SIGNAL INPUT TERMINAL, A MAGNETIC HEAD HAVING WINDINGS, A BIAS TRANSFORMER HAVING A FIRST PRIMARY AND A FIRST SECONDARY, SAID FIRST PRIMARY BEING COUPLED TO RECEIVE BIAS SIGNALS FROM SAID BIAS SIGNAL INPUT TERMINAL, MEANS FOR ELIMINATING ALL SIGNALS OTHER THAN THE BIAS SIGNALS APPEARING ON SAID FIRST PRIMARY, A RECORD SIGNAL OUTPUT TRANSFORMER HAVING A SECOND PRIMARY AND A SECOND SECONDARY, ONE END OF SAID SECOND PRIMARY AND ONE END OF SAID SECOND SECONDARY BEING JOINED, THE OTHER END OF THE SECOND PRIMARY BEING COUPLED TO THE RECORD SIGNAL INPUT TERMINAL, THE OTHER END OF THE SECOND SECONDARY BEING COUPLED TO A FIRST END OF THE FIRST SECONDARY, A SECOND END OF THE FIRST SECONDARY BEING COUPLED TO THE HEAD WINDINGS, AND MEANS COUPLED BETWEEN THE BIAS TRANSFORMER SECONDARY AND THE RECORD SIGNAL TRANSFORMER SECONDARY FOR SHUNTING THE BIAS SIGNAL TO GROUND.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |