Patent US4786982A successfully refreshed from Google Patents.
Patent US3294304A successfully refreshed from Google Patents.
US3294304A
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Magnetic tape transport and transducing apparatus
Assignee: Ampex Corp
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Filing: 1965-06-11
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Granted: 1966-12-27
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Dinsmore
- 👤 Richard I Seddon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:08
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58; G11B15/18; G11B15/26; G11B15/28; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A MAGNETIC TAPE TRANSPORT AND TRANSDUCING APPAARATUS INCLUDING A ROTATING MEMBER ENGAGING ONE SIDE OF SAID TAPE AND A TRANSDUCING MEANS MOUNTED FOR MOVEMENT BETWEEN RETRACTED AND TRANSDUCING POSITIONS ON THE OTHER SIDE OF SAID TAPE OPPOSITE SAID ROTATING MEMBER, SAID TRANSDUCING MEANS HAVING AT LEAST ONE PAIR OF MAGNETIC POLE TIPS CONFRONTING SAID TAPE IN SAID TRANSDUCING POSITION THEREOF, SAID TIPS BEING OF PREDETERMINED WIDTH IN AN AXIAL DIRECTION OF SAID ROTATING MEMBER, THE IMPROVEMENT COMPRISING: SAID ROTATING MEMBER BEING PROVIDED WITH AT LEAST ONE HELICAL GROOVE COAXIAL THEREWITH AND FORMED IN THE TAPE-ENGAGING SURFACE THEREOF, FOR DEFLATING AIR BEARING BETWEEN SAID TAPE AND ROTATING MEMBER; THE PITCH OF SAID GROOVE BEING AN ALIQUOT PART OF SAID PREDETERMINED POLE TIP WIDTH.
Claim 2
Dependent Claim
123 words
IN A MAGNETIC TAPE TRANSPORT AND TRANSDUCING APPAARATUS INCLUDING A ROTATING MEMBER ENGAGING ONE SIDE OF SAID TAPE AND A TRANSDUCING MEANS MOUNTED FOR MOVEMENT BETWEEN RETRACTED AND TRANSDUCING POSITIONS ON THE OTHER SIDE OF SAID TAPE OPPOSITE SAID ROTATING MEMBER, SAID TRANSDUCING MEANS HAVING AT LEAST ONE PAIR OF MAGNETIC POLE TIPS CONFRONTING SAID TAPE IN SAID TRANSDUCING POSITION THEREOF, SAID TIPS BEING OF PREDETERMINED WIDTH IN AN AXIAL DIRECTION OF SAID ROTATING MEMBER, THE IMPROVEMENT COMPRISING: SAID ROTATING MEMBER BEING PROVIDED WITH AT LEAST ONE HELICAL GROOVE COAXIAL THEREWITH AND FORMED IN THE TAPE-ENGAGING SURFACE THEREOF, FOR DEFLATING AIR BEARING BETWEEN SAID TAPE AND ROTATING MEMBER; THE PITCH OF SAID GROOVE BEING AN ALIQUOT PART OF SAID PREDETERMINED POLE TIP WIDTH.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |