US3209891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic work holder and method
Assignee: Individual
•
Filing: 1961-12-14
•
Granted: 1965-10-05
•
Expires: 1981-12-14
Abstract
No abstract record available.
Inventors
- 👤 Arthur K Littwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:40
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1543; B23Q3/1546
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
APPARATUS OF THE CHARACTER DISCLOSED COMPRISING A WORK HOLDER OF PERMANENT MAGNETIC MATERIAL AND ADAPTED TO MAGNETICALLY HOLD MAGNETIC WORK PIECES, MEANS FOR MOVING THE WORK HOLDER THROUGH A PREDETERMINED PATH, AND ELECTROMAGNETIC MEANS LOCATED ADJACENT THE PATH AND OPERATIVE FOR DEMAGNETIZING THE WORK HOLDER AND THE WORK PIECES THEREON AND THEREBY RELEASING THE WORK PIECES MAGNETICALLY HELD THEREBY, AND THEREAFTER MAGNETIZING THE WORK HOLDER.
Claim 2
Dependent Claim
65 words
APPARATUS OF THE CHARACTER DISCLOSED COMPRISING A WORK HOLDER OF PERMANENT MAGNETIC MATERIAL AND ADAPTED TO MAGNETICALLY HOLD MAGNETIC WORK PIECES, MEANS FOR MOVING THE WORK HOLDER THROUGH A PREDETERMINED PATH, AND ELECTROMAGNETIC MEANS LOCATED ADJACENT THE PATH AND OPERATIVE FOR DEMAGNETIZING THE WORK HOLDER AND THE WORK PIECES THEREON AND THEREBY RELEASING THE WORK PIECES MAGNETICALLY HELD THEREBY, AND THEREAFTER MAGNETIZING THE WORK HOLDER.
Claim 3
Independent Claim
16 words
THE METHOD OF CONTROLLING THE MAGNETIC HOLDING OF WORK PIECES BY PERMANENT MAGNET WORK HOLDERS COM-
Claim 4
Independent Claim
16 words
THE METHOD OF CONTROLLING THE MAGNETIC HOLDING OF WORK PIECES BY PERMANENT MAGNET WORK HOLDERS COM-
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |