Patent US3238402A successfully refreshed from Google Patents.
US3238402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic clutch
Assignee: EW Bliss Co Inc
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Filing: 1960-07-26
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Granted: 1966-03-01
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Expires: 1980-07-26
Abstract
No abstract record available.
Inventors
- 👤 Frank P Fehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:05
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A MAGNETIC SLIP CLUTCH COMPRISING COAXIAL DRIVING AND DRIVEN MEMBERS ONE SAID MEMBER INCLUDING TWO CIRCULARLY ARRANGED AXIALLY SPACED ARRAYS OF MAGNETIC FLUX CONCENTRATING POLES, THE TWO SERIES HAVING PARALLEL ORBITS AROUND THE COMMON AXIS OF THE DRIVING AND DRIVEN MEMBERS, A FIELD UNIT IN SYMMETRICAL AXIAL RELATION TO THE TWO ARRAYS OF POLES TO EXTEND FLUX OF ONE POLARITY TO ONE ARRAY OF POLES AND FLUX OF RELATIVELY OPPOSITE POLARITY TO THE OTHER ARRAY OF POLES, AND THE OTHER OF THE COAXIAL MEMBERS INCLUDING A COMPOSITE RING COMPOSED OF A FERROMAGNTIC CYLINDRICAL BAND MAGNETICALLY COUPLING SAID SPACED ARRAYS AND A LOW MAGNETICALLY PERMEABLE LOW OHMIC RESISTANCE FACING FOR THE FERROMAGNETIC BAND HAVING SUBSTANTIAL INDUCTIVE CURRENT CARRYING CAPACITY, THE COMPOSITE RING ALSO INCLUDING AXIALLY SPACED FERROMAGNETIC HOOPS ENCIRCLING SAID FACING AT SURFACES OPPOSITE THE SURFACES OF THE FACING ENGAGED WITH THE FERROMAGNETIC BAND, SAID HOOPS BEING AXIALLY LOCATED IN CONCENTRIC CLEARANCE RELATION TO THE ORBITS OF THE AXIALLY SPACED ARRAYS OF FLUX CONCENTRATING POLES.
Claim 2
Dependent Claim
164 words
A MAGNETIC SLIP CLUTCH COMPRISING COAXIAL DRIVING AND DRIVEN MEMBERS ONE SAID MEMBER INCLUDING TWO CIRCULARLY ARRANGED AXIALLY SPACED ARRAYS OF MAGNETIC FLUX CONCENTRATING POLES, THE TWO SERIES HAVING PARALLEL ORBITS AROUND THE COMMON AXIS OF THE DRIVING AND DRIVEN MEMBERS, A FIELD UNIT IN SYMMETRICAL AXIAL RELATION TO THE TWO ARRAYS OF POLES TO EXTEND FLUX OF ONE POLARITY TO ONE ARRAY OF POLES AND FLUX OF RELATIVELY OPPOSITE POLARITY TO THE OTHER ARRAY OF POLES, AND THE OTHER OF THE COAXIAL MEMBERS INCLUDING A COMPOSITE RING COMPOSED OF A FERROMAGNTIC CYLINDRICAL BAND MAGNETICALLY COUPLING SAID SPACED ARRAYS AND A LOW MAGNETICALLY PERMEABLE LOW OHMIC RESISTANCE FACING FOR THE FERROMAGNETIC BAND HAVING SUBSTANTIAL INDUCTIVE CURRENT CARRYING CAPACITY, THE COMPOSITE RING ALSO INCLUDING AXIALLY SPACED FERROMAGNETIC HOOPS ENCIRCLING SAID FACING AT SURFACES OPPOSITE THE SURFACES OF THE FACING ENGAGED WITH THE FERROMAGNETIC BAND, SAID HOOPS BEING AXIALLY LOCATED IN CONCENTRIC CLEARANCE RELATION TO THE ORBITS OF THE AXIALLY SPACED ARRAYS OF FLUX CONCENTRATING POLES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |