Patent US3258750A successfully refreshed from Google Patents.
US3258750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-channel magnetic recording systems
Assignee: —
•
Filing: —
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Granted: 1966-06-28
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Expires: 1983-06-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59633; G11B5/488; G11B5/54; G11B5/55; G11B5/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A MAGNETIC RECORDING SYSTEM COMPRISING THE COMBINATION OF A RECORD MEMBER HAVING A PLURALITY OF DISCRETE MAGNETIC RECORDING TRACKS, ADJACENT PAIRS OF WHICH HAVE A PREDETERMINED CENTER-TO-CENTER SPACING, A MAGNETIC TRANSDUCER, MEANS FOR MOUNTING SAID MAGNETIC TRANSDUCER IS OPERATIVE RELATIONSHIP WITH AT LEAST ONE OF SAID TRACKS WITH THE RESPECTIVE CENTER LINES OF THE TRANSDUCER AND ONE TRACK COINCIDING EXCEPT FOR ALLOWABLE PLUS AND MINUS TOLERANCES OF SAID MOUNTING MEANS IN DIRECTIONS TRANSVERSE TO THE LENGTHWISE DIRECTION ON SAID TRACK, A NON-MAGNETIC LAND HAVING A WIDTH WHICH IS NOT LESS THEN THE SUM OF SAID MAXIMUM ALLOWABLE PLUS AND MINUS TOLERANCES OF SAID MOUNTING MEANS, DISPOSED BETWEEN EACH OF SAID PAIRS OF ADJACENT TRACKS, SAID TRANSDUCER HAVING A SINGLE GAP WHOSE OPERATIVE WIDTH DURING RECORDING AND REPRODUCING OPERATIONS IS NOT LESS THAN THE WIDTH OF SAID DISCRETE TRACK PLUS SAID MAXIMUM TOLERANCES AND NOT GREATER THAN SAID CENTER-TO-CENTER SPACING OF SAID TRACKS.
Claim 2
Dependent Claim
152 words
A MAGNETIC RECORDING SYSTEM COMPRISING THE COMBINATION OF A RECORD MEMBER HAVING A PLURALITY OF DISCRETE MAGNETIC RECORDING TRACKS, ADJACENT PAIRS OF WHICH HAVE A PREDETERMINED CENTER-TO-CENTER SPACING, A MAGNETIC TRANSDUCER, MEANS FOR MOUNTING SAID MAGNETIC TRANSDUCER IS OPERATIVE RELATIONSHIP WITH AT LEAST ONE OF SAID TRACKS WITH THE RESPECTIVE CENTER LINES OF THE TRANSDUCER AND ONE TRACK COINCIDING EXCEPT FOR ALLOWABLE PLUS AND MINUS TOLERANCES OF SAID MOUNTING MEANS IN DIRECTIONS TRANSVERSE TO THE LENGTHWISE DIRECTION ON SAID TRACK, A NON-MAGNETIC LAND HAVING A WIDTH WHICH IS NOT LESS THEN THE SUM OF SAID MAXIMUM ALLOWABLE PLUS AND MINUS TOLERANCES OF SAID MOUNTING MEANS, DISPOSED BETWEEN EACH OF SAID PAIRS OF ADJACENT TRACKS, SAID TRANSDUCER HAVING A SINGLE GAP WHOSE OPERATIVE WIDTH DURING RECORDING AND REPRODUCING OPERATIONS IS NOT LESS THAN THE WIDTH OF SAID DISCRETE TRACK PLUS SAID MAXIMUM TOLERANCES AND NOT GREATER THAN SAID CENTER-TO-CENTER SPACING OF SAID TRACKS.
References Cited (Backward Citations)
US2144844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |