Patent US3155256A successfully refreshed from Google Patents.
Patent US3074523A successfully refreshed from Google Patents.
US3074523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fluid clutch
Assignee: Individual
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Filing: 1962-01-30
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Granted: 1963-01-22
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Expires: 1982-01-30
Abstract
No abstract record available.
Inventors
- 👤 John O Yeiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:40
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; F16D2037/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A MAGNETIC FLUID CLUTCH COMPRISING: A SUBSTANTIALLY CYLINDRICAL HOUSING HAVING A SUBSTANTIALLY PLANAR INTERIOR END SURFACE, A DRIVING SHAFT CONNECTED TO SAID HOUSING ON ITS AXIS, A MAGNETIC FLUID FILL IN SAID HOUSING, A SUBSTANTIALLY DISC-SHAPED DRIVEN MEMBER LOCATED IN SAID HOUSING AND HAVING A FLAT SURFACE SPACED RELATIVELY CLOSELY TO AND PARALLEL TO SAID PLANAR INTERIOR END SURFACE, A SUBSTANTIALLY DISC-SHAPED ANNULARLY CORRUGATED FLEXIBLE MEMBER CLOSING THE END OF SAID HOUSING OPPOSITE SAID PLANAR INTERIOR END SURFACE, AN INTERMEDIATE SHAFT EXTENDING THROUGH SAID FLEXIBLE MEMBER, SAID INTERMEDIATE SHAFY BEING SPACED FROM BUT PARALLEL TO ASID AXIS, AND ATTACHED PERPENDICULARLY TO SAID DRIVEN MEMBER, A DRIVEN SHAFT COAXIAL WITH SAID DRIVING SHAFT, A CRANK MEMBER CONNECTED RIGIDLY TO SAID DRIVEN SHAFT AND HAVING A BEARING SPACED FROM BUT PARALLEL TO SAID AXIS, SAID INTERMEDIATE SHAFT BEING JOURNALLED IN SAID BEARING, AND MEANS TO CONTROLLABLY MAGNETIZE SAID FLUID TO CONTROL ITS VISCOSITY, WHEREBY ROTARY MOTION IS TRANSMITTED PREDOMINANTLY BY VISCOUS SHEAR OF SAID FLUID IN THE SPACE BETWEEN SAID PLANAR INTERIOR END SURFACE AND SAID FLAT SURFACE OF SAID DRIVEN MEMBER.
Claim 2
Dependent Claim
180 words
A MAGNETIC FLUID CLUTCH COMPRISING: A SUBSTANTIALLY CYLINDRICAL HOUSING HAVING A SUBSTANTIALLY PLANAR INTERIOR END SURFACE, A DRIVING SHAFT CONNECTED TO SAID HOUSING ON ITS AXIS, A MAGNETIC FLUID FILL IN SAID HOUSING, A SUBSTANTIALLY DISC-SHAPED DRIVEN MEMBER LOCATED IN SAID HOUSING AND HAVING A FLAT SURFACE SPACED RELATIVELY CLOSELY TO AND PARALLEL TO SAID PLANAR INTERIOR END SURFACE, A SUBSTANTIALLY DISC-SHAPED ANNULARLY CORRUGATED FLEXIBLE MEMBER CLOSING THE END OF SAID HOUSING OPPOSITE SAID PLANAR INTERIOR END SURFACE, AN INTERMEDIATE SHAFT EXTENDING THROUGH SAID FLEXIBLE MEMBER, SAID INTERMEDIATE SHAFY BEING SPACED FROM BUT PARALLEL TO ASID AXIS, AND ATTACHED PERPENDICULARLY TO SAID DRIVEN MEMBER, A DRIVEN SHAFT COAXIAL WITH SAID DRIVING SHAFT, A CRANK MEMBER CONNECTED RIGIDLY TO SAID DRIVEN SHAFT AND HAVING A BEARING SPACED FROM BUT PARALLEL TO SAID AXIS, SAID INTERMEDIATE SHAFT BEING JOURNALLED IN SAID BEARING, AND MEANS TO CONTROLLABLY MAGNETIZE SAID FLUID TO CONTROL ITS VISCOSITY, WHEREBY ROTARY MOTION IS TRANSMITTED PREDOMINANTLY BY VISCOUS SHEAR OF SAID FLUID IN THE SPACE BETWEEN SAID PLANAR INTERIOR END SURFACE AND SAID FLAT SURFACE OF SAID DRIVEN MEMBER.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |