Patent US1874890A successfully refreshed from Google Patents.
Patent US3197210A successfully refreshed from Google Patents.
US3197210A
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Recording and biasing head assembly for magnetic tape recorders
Assignee: Akai Electric Co Ltd
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Filing: 1962-12-17
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Granted: 1965-07-27
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Atsumi Katsuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:14
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B5/00; G11B5/02; G11B5/48; G11B5/488; G11B5/4893; G11B5/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN A MAGNETIC TAPE RECORDER COMPRISING IN COMBINATION: (1) A RECORDING HEAD INCLUDING A RECORDING GAP, (2) A MAGNETIC RECORDING TAPE HAVING A BASE AND MAGNETIC LAYER CARRIED BY SAID BASE, SAID TAPE ARRANGED TO MOVE ACROSS SAID GAP WITH SAID LAYER IN SURFACE CONTACT WITH SAID HEAD, (3) A SEPARATE BIASING HEAD INCLUDING A BIASING GAP, AND (4) MEANS TO MAINTAIN SAID BIASING GAP AT A PREDETERMINED FIXED AND SPACED RELATION TO SAID RECORDING GAP COMPRISING
Claim 2
Dependent Claim
77 words
IN A MAGNETIC TAPE RECORDER COMPRISING IN COMBINATION: (1) A RECORDING HEAD INCLUDING A RECORDING GAP, (2) A MAGNETIC RECORDING TAPE HAVING A BASE AND MAGNETIC LAYER CARRIED BY SAID BASE, SAID TAPE ARRANGED TO MOVE ACROSS SAID GAP WITH SAID LAYER IN SURFACE CONTACT WITH SAID HEAD, (3) A SEPARATE BIASING HEAD INCLUDING A BIASING GAP, AND (4) MEANS TO MAINTAIN SAID BIASING GAP AT A PREDETERMINED FIXED AND SPACED RELATION TO SAID RECORDING GAP COMPRISING
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |