US3187111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording heads with monitor of recorded signal
Assignee: Ampex Corp
•
Filing: 1961-01-23
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Granted: 1965-06-01
•
Expires: 1981-01-23
Abstract
No abstract record available.
Inventors
- 👤 Smaller Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:55
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1816; G11B5/00; G11B5/127; G11B5/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A MAGNETIC RECORDING AND REPRODUCING SYSTEM COMPRISING: A MAGNETIC TRANSDUCING DEVICE HAVING AT LEAST ONE NONMAGNETIC GAP; AN INPUT SIGNAL MEANS COUPLED TO SAID DEVICE FOR PROVIDING A HIGH FREQUENCY CARRIER SIGNAL MODULATED BY A RELATIVELY LOW FREQUENCY INFORMATION SIGNAL; A MOVABLE MAGNETIC STORAGE MEDIUM FOR DEMODULATING AND RECORDING SAID INFORMATION SIGNAL AT SAID GAP; AND AN OUTPUT SIGNAL PROCESSING MEANS, INCLUDING A LOW PASS FILTER COUPLED TO SAID TRANSDUCING DEVICE FOR REPRODUCING ONLY SAID INFORMATION SIGNAL SIMULTANEOUSLY WITH THE RECORDING THEREOF.
References Cited (Backward Citations)
US1886616A
Cited
US2649506A
Cited
US2722569A
Cited
US2995631A
Cited
US2804499A
Cited
US2969529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |