Patent US3418542A successfully refreshed from Google Patents.
US3418542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for demagnetization of multipole magnetic devices
Assignee: F W BELL Inc
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Filing: 1966-04-18
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Granted: 1968-12-24
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Expires: 1986-04-18
Abstract
No abstract record available.
Inventors
- 👤 Donald J Renner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:50
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003; H01F13/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF DECREASING THE MAGNETIC FLUX DENSITY OF A MULTI-POLE MAGNETIC DEVICE CONSISTING OF SUBJECTING EACH POLE TO A RESPECTIVE, INDEPENDENTLY CONTROLLABLE, RELATIVELY NEGATIVE MAGNETIC FIELD INTENSITY WHICH IS APPLIED UNTIL THE MAGNETIC FLUX DENSITY OF THE SPECIFIC POLE IS REDUCED TO A PREDETERMINED NOMINAL MAGNITUDE WHICH IS GREATER THAN AN ULTIMATE DESIRED MAGNETIC FLUX DENSITY,
Claim 2
Independent Claim
57 words
THE METHOD OF DECREASING THE MAGNETIC FLUX DENSITY OF A MULTI-POLE MAGNETIC DEVICE CONSISTING OF SUBJECTING EACH POLE TO A RESPECTIVE, INDEPENDENTLY CONTROLLABLE, RELATIVELY NEGATIVE MAGNETIC FIELD INTENSITY WHICH IS APPLIED UNTIL THE MAGNETIC FLUX DENSITY OF THE SPECIFIC POLE IS REDUCED TO A PREDETERMINED NOMINAL MAGNITUDE WHICH IS GREATER THAN AN ULTIMATE DESIRED MAGNETIC FLUX DENSITY,
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |