US3313890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maximum density magnetic recording apparatus
Assignee: Individual
•
Filing: 1962-02-28
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Granted: 1967-04-11
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Expires: 1982-02-28
Abstract
No abstract record available.
Inventors
- 👤 Lopez-Henriquez Miguel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B23/00; G11B23/0007; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A TRANSDUCER FOR RECORDING ON OR REPRODUCING FROM MAGNETIC TAPE, A ROTATABLE DRUM COMPRISING ON ITS PERIPHERY TWO OPPOSITE POLE PORTIONS OF MAGNETICALLY PERMEABLE MATERIAL SEPARATED BY A NARROW NON-MAGNETIC GAP EXTENDING SPIRALLY OF SAID DRUM, A MAGNETIC WINDING IN SAID DRUM HAVING POLES MAGNETICALLY COUPLED RESPECTIVELY WITH SAID POLE PORTIONS, ELECTRICAL CONNECTIONS BETWEEN SAID WINDING AND A SIGNAL CIRCUIT, A NARROW STATIONARY PRESSURE BAR EXTENDING LENGTHWISE ALONG THE PERIPHERY OF SAID DRUM, SAID PRESSURE BAR HAVING A CONCAVE EDGE FACING SAID DRUM AND ADAPTED TO HOLD A NARROW SHARPLY DEFINED TRANSVERSE ZONE OF SAID TAPE IN INTIMATE CONTACT WITH SAID DRUM THROUGH THE WIDTH OF SAID ZONE, TAPE TRANSPORT MEANS FOR
Claim 2
Dependent Claim
113 words
IN A TRANSDUCER FOR RECORDING ON OR REPRODUCING FROM MAGNETIC TAPE, A ROTATABLE DRUM COMPRISING ON ITS PERIPHERY TWO OPPOSITE POLE PORTIONS OF MAGNETICALLY PERMEABLE MATERIAL SEPARATED BY A NARROW NON-MAGNETIC GAP EXTENDING SPIRALLY OF SAID DRUM, A MAGNETIC WINDING IN SAID DRUM HAVING POLES MAGNETICALLY COUPLED RESPECTIVELY WITH SAID POLE PORTIONS, ELECTRICAL CONNECTIONS BETWEEN SAID WINDING AND A SIGNAL CIRCUIT, A NARROW STATIONARY PRESSURE BAR EXTENDING LENGTHWISE ALONG THE PERIPHERY OF SAID DRUM, SAID PRESSURE BAR HAVING A CONCAVE EDGE FACING SAID DRUM AND ADAPTED TO HOLD A NARROW SHARPLY DEFINED TRANSVERSE ZONE OF SAID TAPE IN INTIMATE CONTACT WITH SAID DRUM THROUGH THE WIDTH OF SAID ZONE, TAPE TRANSPORT MEANS FOR
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |