US2929787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite with constricted magnetic hysteresis loop
Assignee: Steatit Magnesia AG
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Filing: 1956-10-17
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Granted: 1960-03-22
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Expires: 1976-10-17
Abstract
No abstract record available.
Inventors
- 👤 Eckert Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:55
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A FIRED FERRITE BODY HAVING A CONSTRICTEDC MAGNETIC HYSTERSIS LOOP ON WHICH FERRITE IS SUSCEPTIBLE TO THERMOMAGNETIC TREATMENTS TO ALTER THE HYSTERESIS LOOP CHARACTERISTICS, SAID FERRITE BEING OF THE MANGANESE-, ZINC-, IRON OXIDE SYSTEM CONTAINING A SMALL PROPORTION OF COBALT OXIDE, THE IRON OXIDE CONTENT OF SAID COMPOSITION BEING AT LEAST 50 MOL PERCENT EXPRESSED IN METAL OXIDES, SAID CONSTRICTED MAGNETIC HYSTERESIS LOOP CHARACTERISTIC BEING OBTAINED BY GRADUALLY COOLING THE FIRED BODY FROM 700*C. DOWN TO ROOM TEMPERATURE OVER A PERIOD OF AT LEAST TWELVE HOURS.
Claim 2
Dependent Claim
86 words
A FIRED FERRITE BODY HAVING A CONSTRICTEDC MAGNETIC HYSTERSIS LOOP ON WHICH FERRITE IS SUSCEPTIBLE TO THERMOMAGNETIC TREATMENTS TO ALTER THE HYSTERESIS LOOP CHARACTERISTICS, SAID FERRITE BEING OF THE MANGANESE-, ZINC-, IRON OXIDE SYSTEM CONTAINING A SMALL PROPORTION OF COBALT OXIDE, THE IRON OXIDE CONTENT OF SAID COMPOSITION BEING AT LEAST 50 MOL PERCENT EXPRESSED IN METAL OXIDES, SAID CONSTRICTED MAGNETIC HYSTERESIS LOOP CHARACTERISTIC BEING OBTAINED BY GRADUALLY COOLING THE FIRED BODY FROM 700*C. DOWN TO ROOM TEMPERATURE OVER A PERIOD OF AT LEAST TWELVE HOURS.
References Cited (Backward Citations)
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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) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |