Patent US4244154A successfully refreshed from Google Patents.
US3333753A
Expired / Lapsed
US
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Helical scan magnetic tape apparatus with a squeeze film bearing
Assignee: Ampex Corp
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Filing: 1965-06-17
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Granted: 1967-08-01
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Expires: 1985-06-17
Abstract
No abstract record available.
Inventors
- 👤 John H Streets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:13
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G05; G05D; G05D13/00; G05D13/62; G11B15/61; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN MAGNETIC TAPE APPARATUS, A HELICAL GUIDING ASSEMBLY COMPRISING A PAIR OF SUBSTANTIALLY CYLINDRICAL COAXIALLY CLOSELY SPACED DRUMS HAVING A CLEARANCE GAP THEREBETWEEN, ONE OF SAID DRUMS BEING FIXED AND THE OTHER BEING ROTATABLE RELATIVE TO THE FIXED DRUM, SAID ROTATABLE DRUM HAVING A PROTUBERANCE ON ITS PERIPHERAL SURFACE ADJACENT SAID GAP, MEANS FOR GUIDING MAGNETIC TAPE ALONG A HELICAL PATH ABOUT SAID DRUMS EXTENDING SUBSTANTIALLY DIAGONALLY ACROSS SAID GAP, AND MEANS FOR ROTATING SAID ROTATABLE DRUM TO GENERATE A SELF-ACTING AIR BEARING BENEATH THE DIAGONAL HALF OF THE TAPE OVERLYING SAME AND TO GENERATE A SQUEEZE FILM AIR BEARING BENEATH THE DIAGONAL HALF OF THE TAPE OVERLYING THE STATIONARY DRUM BY PENETRATION OF SAID PROTUBERANCE INTO SAID TAPE.
Claim 2
Dependent Claim
119 words
IN MAGNETIC TAPE APPARATUS, A HELICAL GUIDING ASSEMBLY COMPRISING A PAIR OF SUBSTANTIALLY CYLINDRICAL COAXIALLY CLOSELY SPACED DRUMS HAVING A CLEARANCE GAP THEREBETWEEN, ONE OF SAID DRUMS BEING FIXED AND THE OTHER BEING ROTATABLE RELATIVE TO THE FIXED DRUM, SAID ROTATABLE DRUM HAVING A PROTUBERANCE ON ITS PERIPHERAL SURFACE ADJACENT SAID GAP, MEANS FOR GUIDING MAGNETIC TAPE ALONG A HELICAL PATH ABOUT SAID DRUMS EXTENDING SUBSTANTIALLY DIAGONALLY ACROSS SAID GAP, AND MEANS FOR ROTATING SAID ROTATABLE DRUM TO GENERATE A SELF-ACTING AIR BEARING BENEATH THE DIAGONAL HALF OF THE TAPE OVERLYING SAME AND TO GENERATE A SQUEEZE FILM AIR BEARING BENEATH THE DIAGONAL HALF OF THE TAPE OVERLYING THE STATIONARY DRUM BY PENETRATION OF SAID PROTUBERANCE INTO SAID TAPE.
References Cited (Backward Citations)
US2968702A
Cited
US2998495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |