Patent US3143312A successfully refreshed from Google Patents.
US3143312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape drive
Assignee: International Business Machines Corp
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Filing: 1962-01-08
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Granted: 1964-08-04
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Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Leonard R Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:14
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A TAPE DRIVE SYSTEM COMPRISING A REEL, DRIVE MEANS, A PNEUMATIC CLUTCH, A TAPE COLUMN PROVIDED WITH PRESSURE AT ONE END AND A PARTIAL VACUUM AT THE OTHER END AND A PORT INTERMEDIATE THE END OF SAID TAPE COLUMN, MEANS FOR COUPLING SAID PORT TO SAID CLUTCH, SAID CLUTCH SELECTIVELY ACTUABLE ACCORDING TO THE CONDITION OF PRESSURE SENSED AT SAID PORT TO DRIVE SAID REEL, SAID CONDITION OF PRESSURE DETERMINED BY THE POSITION OF A TAPE IN SAID TAPE COLUMN RELATIVE TO SAID PORT.
Claim 2
Dependent Claim
84 words
A TAPE DRIVE SYSTEM COMPRISING A REEL, DRIVE MEANS, A PNEUMATIC CLUTCH, A TAPE COLUMN PROVIDED WITH PRESSURE AT ONE END AND A PARTIAL VACUUM AT THE OTHER END AND A PORT INTERMEDIATE THE END OF SAID TAPE COLUMN, MEANS FOR COUPLING SAID PORT TO SAID CLUTCH, SAID CLUTCH SELECTIVELY ACTUABLE ACCORDING TO THE CONDITION OF PRESSURE SENSED AT SAID PORT TO DRIVE SAID REEL, SAID CONDITION OF PRESSURE DETERMINED BY THE POSITION OF A TAPE IN SAID TAPE COLUMN RELATIVE TO SAID PORT.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |