US3082925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum capstans
Assignee: Soroban Engineering Inc
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Filing: 1960-12-05
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Granted: 1963-03-26
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Expires: 1980-12-05
Abstract
No abstract record available.
Inventors
- 👤 John H Macneill
- 👤 Charles F West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:05
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
166 words
IN COMBINATION, AN INNER MAGNETIC POLE, AN OUTER MAGNETIC POLE ENCIRCLING SAID INNER POLE, A ROTATABLE CAPSTAN DISPOSED BETWEEN SAID POLES AND HAVING A PLURALITY OF APERTURES THEREIN, A COIL VALVE COMPRISING A PLURALITY OF SPACED TURNS OF CONDUCTIVE MATERIAL DISPOSED BETWEEN SAID CAPSTAN AND SAID INNER POLE, AN ARCUATE AIR GAP BETWEEN A PREDETERMINED SECTION OF SAID CAPSTAN AND SAID OUTER POLE FOR RECEIVING A FLEXIBLE MEMBER, A PLURALITY OF APERTURES IN SAID INNER POLE GENERALLY IN ALIGNMENT WITH SAID APERTURES IN SAID CAPSTAN AND IN ALIGNMENT WITH SAID PREDETERMINED SECTION, SAID APERTURES IN SAID INNER POLE BEING DIVIDED INTO TWO GROUPS, ONE OF SAID GROUPS OF APERTURES BEING ADAPTED TO BE PLACED IN COMMUNICATION WITH A SOURCE OF PRESSURE LESS THAN THE AMBIENT PRESSURE AND THE OTHER OF SAID GROUPS OF APERTURES BEING ADAPTED TO BE PLACED IN COMMUNICATION WITH A SOURCE OF PRESSURE AT LEAST AS GREAT AS THE AMBIENT PRESSURE, MEANS FOR ESTABLISHING A MAGNETIC FIELD THROUGH SAID POLES AND ACROSS SAID
References Cited (Backward Citations)
US2954911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |