Patent US3242269A successfully refreshed from Google Patents.
US3242269A
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Flux sensitive magnetic transducer with automatic gain control
Assignee: Ampex Corp
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Filing: 1961-10-30
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Granted: 1966-03-22
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Donald A Pettengill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0007; G11B5/00; G11B5/127; G11B5/33; G11B5/335; H; H03; H03G; H03G3/00; H03G3/20; H03G3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A MAGNETIC REPRODUCE SYSTEM FOR PROCESSING SIGNALS OF RELATIVELY LOW FREQUENCY COMPRISING: A MAGNETIC TRANSDUCER HAVING A NONMAGNETIC GAP AND SIGNAL WINDINGS COUPLED THERETO; MEANS FOR APPLYING AN EXCITER FREQUENCY SIGNAL TO SAID TRANSDUCER TO DEVELOP A FLUX THEREIN; MEANS INCLUDING SAID GAP FOR TRANSDUCING A RECORDED SIGNAL SO THAT MAGNETIC FLUX REPRESENTATIVE OF SUCH RECORDED SIGNAL IS DEVELOPED IN SAID TRANSDUCER; MEANS FOR APPLYING A PILOT SIGNAL TO SAID WINDINGS TO DEVELOP ADDITIONAL MAGNETIC FLUX FOR COMBINATION WITH THE FLUX REPRESENTATIVE OF THE RECORDED SIGNAL; MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID TRANSDUCER CORRESPONDING TO THE COMBINED MAGNETIC FLUX AND CONTAINING RECORD INFORMATION AND COMPENSATION INFORMATION FROM SAID TRANSDUCER; AND CLOSED LOOP AUTOMATIC GAIN CONTROL CIRCUIT MEANS COUPLED TO SAID MAGNETIC TRANSDUCER AND SAID OUTPUT SIGNAL DERIVING MEANS FOR COMPARING THE COMPENSATION INFORMATION PORTION OF THE OUTPUT SIGNAL WITH A REFERENCE SIGNAL TO OBTAIN AN ERROR SIGNAL FOR STABILIZING THE GAIN CHARACTERISTIC OF SAID REPRODUCE SYSTEM.
Claim 2
Dependent Claim
158 words
A MAGNETIC REPRODUCE SYSTEM FOR PROCESSING SIGNALS OF RELATIVELY LOW FREQUENCY COMPRISING: A MAGNETIC TRANSDUCER HAVING A NONMAGNETIC GAP AND SIGNAL WINDINGS COUPLED THERETO; MEANS FOR APPLYING AN EXCITER FREQUENCY SIGNAL TO SAID TRANSDUCER TO DEVELOP A FLUX THEREIN; MEANS INCLUDING SAID GAP FOR TRANSDUCING A RECORDED SIGNAL SO THAT MAGNETIC FLUX REPRESENTATIVE OF SUCH RECORDED SIGNAL IS DEVELOPED IN SAID TRANSDUCER; MEANS FOR APPLYING A PILOT SIGNAL TO SAID WINDINGS TO DEVELOP ADDITIONAL MAGNETIC FLUX FOR COMBINATION WITH THE FLUX REPRESENTATIVE OF THE RECORDED SIGNAL; MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID TRANSDUCER CORRESPONDING TO THE COMBINED MAGNETIC FLUX AND CONTAINING RECORD INFORMATION AND COMPENSATION INFORMATION FROM SAID TRANSDUCER; AND CLOSED LOOP AUTOMATIC GAIN CONTROL CIRCUIT MEANS COUPLED TO SAID MAGNETIC TRANSDUCER AND SAID OUTPUT SIGNAL DERIVING MEANS FOR COMPARING THE COMPENSATION INFORMATION PORTION OF THE OUTPUT SIGNAL WITH A REFERENCE SIGNAL TO OBTAIN AN ERROR SIGNAL FOR STABILIZING THE GAIN CHARACTERISTIC OF SAID REPRODUCE SYSTEM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |