Patent US2646921A successfully refreshed from Google Patents.
Patent US3121193A successfully refreshed from Google Patents.
US3121193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet work holding device
Assignee: O S WALKER COMPANY Inc
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Filing: 1960-05-05
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Granted: 1964-02-11
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Expires: 1980-05-05
Abstract
No abstract record available.
Inventors
- 👤 John N Engelsted
- 👤 Bauer Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1546
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A PERMANENT MAGNET WORK HOLDING DEVICE COMPRISING, A BODY MEMBER, A PLURALITY OF ELONGATED FERROMAGNETIC POLE MEMBERS SUPPORTED ON THE BODY MEMBER AND ARRANGED IN PARALLEL SPACED-APART RELATION TRANSVERSELY OF THE BODY, SAID POLE MEMBERS AT LEAST IN PART FORMING A WORK ENGAGEABLE SURFACE, AND PERMANENT MAGNET MEANS SUPPORTED ON THE BODY MEMBER IN TRANSVERSE PARALLEL RELATION AND PROVIDING A PLURALITY OF SPACED-APART ELONGATED POLE FACES ALIGNED WITH SAID POLE MEMBERS IN UNDERLYING RELATION THERETO, NEXT ADJACENT POLE FACES BEING OF OPPOSITE POLARITY WHEREBY NEXT ADJACENT POLE MEMBERS ARE OF OPPOSITE POLARITY, THE MAGNETIC FIELD AT EACH OF SAID POLE FACES BEING SUBSTANTIALLY OF EQUAL STRENGTH, THE POLE MEMBERS AND MAGNET MEANS BEING MOUNTED FOR RELATIVE ANGULAR MOVEMENT ABOUT AN AXIS EXTENDING AT RIGHT ANGLES TO SAID WORK ENGAGEABLE SURFACE AND BETWEEN A WORK HOLDING POSITION WHEREIN THE POLE FACES AND POLE MEMBERS ARE IN ALIGNMENT IN FLUX CONDUCTING RELATION AND A WORK RELEASING POSITION WHEREIN SAID POLE FACES AND POLE MEMBERS ARE ANGULARLY OFFSET RELATIVE TO EACH OTHER AND EACH OF SAID POLE MEMBERS EXTENDING ACROSS A PLURALITY OF POLE FACES OF THE SAME POLARITY AND IN SHUNTING RELATION WITH POLE FACES OF OPPOSITE POLARITY.
Claim 2
Dependent Claim
196 words
A PERMANENT MAGNET WORK HOLDING DEVICE COMPRISING, A BODY MEMBER, A PLURALITY OF ELONGATED FERROMAGNETIC POLE MEMBERS SUPPORTED ON THE BODY MEMBER AND ARRANGED IN PARALLEL SPACED-APART RELATION TRANSVERSELY OF THE BODY, SAID POLE MEMBERS AT LEAST IN PART FORMING A WORK ENGAGEABLE SURFACE, AND PERMANENT MAGNET MEANS SUPPORTED ON THE BODY MEMBER IN TRANSVERSE PARALLEL RELATION AND PROVIDING A PLURALITY OF SPACED-APART ELONGATED POLE FACES ALIGNED WITH SAID POLE MEMBERS IN UNDERLYING RELATION THERETO, NEXT ADJACENT POLE FACES BEING OF OPPOSITE POLARITY WHEREBY NEXT ADJACENT POLE MEMBERS ARE OF OPPOSITE POLARITY, THE MAGNETIC FIELD AT EACH OF SAID POLE FACES BEING SUBSTANTIALLY OF EQUAL STRENGTH, THE POLE MEMBERS AND MAGNET MEANS BEING MOUNTED FOR RELATIVE ANGULAR MOVEMENT ABOUT AN AXIS EXTENDING AT RIGHT ANGLES TO SAID WORK ENGAGEABLE SURFACE AND BETWEEN A WORK HOLDING POSITION WHEREIN THE POLE FACES AND POLE MEMBERS ARE IN ALIGNMENT IN FLUX CONDUCTING RELATION AND A WORK RELEASING POSITION WHEREIN SAID POLE FACES AND POLE MEMBERS ARE ANGULARLY OFFSET RELATIVE TO EACH OTHER AND EACH OF SAID POLE MEMBERS EXTENDING ACROSS A PLURALITY OF POLE FACES OF THE SAME POLARITY AND IN SHUNTING RELATION WITH POLE FACES OF OPPOSITE POLARITY.
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) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |