US3242269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flux sensitive magnetic transducer with automatic gain control
Assignee: Ampex Corp
•
Filing: 1961-10-30
•
Granted: 1966-03-22
•
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 06:26
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.
References Cited (Backward Citations)
US2279018A
Cited
US2497883A
Cited
US2425213A
Cited
US2855464A
Cited
US2781423A
Cited
US3005878A
Cited
US3041415A
Cited
US3011160A
Cited
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 |