Patent US2272632A successfully refreshed from Google Patents.
US3401313A
Expired / Lapsed
US
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Apparatus and method for controlling magnetism
Assignee: Individual
•
Filing: 1965-12-20
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Granted: 1968-09-10
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Expires: 1985-12-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur K Littwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:42
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
41 words
A METHOD OF CONTROLLING MAGNETISM OF AN ARTICLE COMPRISING PASSING DC THROUGH THE ARTICLE IN A SERIES OF STEPS, IN WHICH THE DC IS OF ALTERNATELY OPPOSITE POLARITY IN SUCCESSIVE STEPS, AND MAINTAINING THE DC OF STEADY VALUE THROUGHOUT EACH STEP.
References Cited (Backward Citations)
US2229104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |