US3143603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record head assembly
Assignee: Ampex Corp
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Filing: 1960-08-29
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Granted: 1964-08-04
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Expires: 1980-08-29
Abstract
No abstract record available.
Inventors
- 👤 Maurice W Widener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/2652; G11B5/2654; G11B5/2655; G11B5/2657; G11B5/2658; G11B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A MAGNETIC RECORD TRANSDUCING ASSEMBLY FOR RECORDING AN INFORMATION SIGNAL ON A MOVABLE MEDIUM COMPRISING: A SINGLE MAGNETIC CORE; AT LEAST ONE SET OF NONMAGNETIC GAPS FORMED IN SAID CORE, EACH SET HAVING THREE GAPS DISPOSED IN SERIES, SAID THREE GAPS HAVING DIMINISHING WIDTHS IN THE DIRECTION OF TRAVEL OF SAID MAGNETIC MEDIUM; A SINGLE BIASING MEANS COUPLED TO SAID CORE; AND MAGNETIC
Claim 2
Dependent Claim
63 words
A MAGNETIC RECORD TRANSDUCING ASSEMBLY FOR RECORDING AN INFORMATION SIGNAL ON A MOVABLE MEDIUM COMPRISING: A SINGLE MAGNETIC CORE; AT LEAST ONE SET OF NONMAGNETIC GAPS FORMED IN SAID CORE, EACH SET HAVING THREE GAPS DISPOSED IN SERIES, SAID THREE GAPS HAVING DIMINISHING WIDTHS IN THE DIRECTION OF TRAVEL OF SAID MAGNETIC MEDIUM; A SINGLE BIASING MEANS COUPLED TO SAID CORE; AND MAGNETIC
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |