US3378734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of demagnetizing
Assignee: Individual
•
Filing: 1965-10-13
•
Granted: 1968-04-16
•
Expires: 1985-10-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur K Littwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:23
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF DEMAGNETIZING AN OBJECT COMPRISING (A) PROVIDING AN AC SOURCE AND CIRCUIT MEANS INCLUDING THE OBJECT, (B) CONVERTING THE AC TO DC, (C) UTILIZING THE CIRCUIT MEANS FOR TRANSMITTING THE DC TO THE OBJECT, (D) REDUCING THE VOLTAGE OF THE DC SUCCESSIVELY IN A NUMBER OF INTERVALS IN A PREDETERMINED CYCLE, (E) REVERSING THE POLARITY OF THE DC IN A NUMBER OF STEPS SIMULTANEOUSLY WITH STEP (D) IN THE SAME CYCLE, AND (F) VARYING AT LEAST ONE OF THE TWO STEPS (D), (E) DURING THE CYCLE; IN THE CASE OF (D) VARYING THE DEGREE OF REDUCTION OF VOLTAGE AT EACH INTERVAL, AND IN THE CASE OF (E) VARYING THE NUMBER OF REVERSALS.
Claim 2
Independent Claim
114 words
THE METHOD OF DEMAGNETIZING AN OBJECT COMPRISING (A) PROVIDING AN AC SOURCE AND CIRCUIT MEANS INCLUDING THE OBJECT, (B) CONVERTING THE AC TO DC, (C) UTILIZING THE CIRCUIT MEANS FOR TRANSMITTING THE DC TO THE OBJECT, (D) REDUCING THE VOLTAGE OF THE DC SUCCESSIVELY IN A NUMBER OF INTERVALS IN A PREDETERMINED CYCLE, (E) REVERSING THE POLARITY OF THE DC IN A NUMBER OF STEPS SIMULTANEOUSLY WITH STEP (D) IN THE SAME CYCLE, AND (F) VARYING AT LEAST ONE OF THE TWO STEPS (D), (E) DURING THE CYCLE; IN THE CASE OF (D) VARYING THE DEGREE OF REDUCTION OF VOLTAGE AT EACH INTERVAL, AND IN THE CASE OF (E) VARYING THE NUMBER OF REVERSALS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |