US3289905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic capstan having a high speed electro-magnetic valve
Assignee: Unisys Corp
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Filing: 1964-09-23
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Granted: 1966-12-06
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Solomon H Pitt
- 👤 Trevor D Reader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:00
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/28; G11B15/285
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
IN COMBINATION WITH A TAPE DRIVE MECHANISM INCLUDING A PNEUMATIC CAPSTAN, A VALVE ARRANGEMENT FOR SELECTIVELY CAUSING SAID TAPE TO ENGAGE OR DISENGAGE SAID CAPSTAN COMPRISING A HOUSING HAVING A CHAMBER, MEANS FOR DIRECTING FLUID FROM SAID CHAMBER TO SAID CAPSTAN, A PAIR OF ELECTRO-MAGNETS DISPOSED WITHIN SAID HOUSING, SOURCES OF HIGH AND LOW FLUID PRESSURE LEADING INTO SAID CHAMBER, A MOVABLE METALLIC DISC DISPOSED WITHIN SAID CHAMBER FOR SELECTIVELY BLOCKING ONE OR THE OTHER OF SAID SOURCES OF FLUID PRESSURE TO PREVENT OR PERMIT FLUID PRESSURE FROM ENTERING SAID CHAMBER, SAID NETALLIC DISC INCLUDING CONCENTRIC MAGNETIZED AREAS IN OPPOISTE POLARITY, AND MEANS FOR SELECTIVELY APPLYING AN ELECTRICAL SIGNAL TO SAID ELECTRO-MAGNETS TO CAUSE SAID DISC TO BE MOVED TO BLOCK ONE OR THE OTHER OF SAID SOURCES.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |