US2989477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite with constricted magnetic hysteresis loop
Assignee: Steatit Magnesia AG
•
Filing: 1956-11-14
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Granted: 1961-06-20
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Expires: 1976-11-14
Abstract
No abstract record available.
Inventors
- 👤 Eckert Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265; C04B35/2608; C04B35/2625; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A FERRITE WITH A CONSTRICTED MAGNETIC HYSTERESIS LOOP SELECTED FROM THE SYSTEMS CONSISTING OF THE COPPER-, ZINC-, IRON OXIDE SYSTEM AND THE COPPER-, CADMIUM IRON OXIDE SYSTEM CONTAINING A SMALL AMOUNT OF COBALT OXIDE, THE IRON OXIDE IN SAID FERRITE COMPRISING AT LEAST 50 MOL PERCENT OF THE COMPOSITION EXPRESSED AS METAL OXIDES AND CONTAINING ABOUT 62.5 TO 91% BY WEIGHT OF FERRIC OXIDE, ABOUT 1% TO 30% BY WEIGHT OF CUO, ABOUT 0.1 TO 5% BY WEIGHT OF COO, AND THE REMAINDER CONSISTING ESSENTIALLY
Claim 2
Dependent Claim
85 words
A FERRITE WITH A CONSTRICTED MAGNETIC HYSTERESIS LOOP SELECTED FROM THE SYSTEMS CONSISTING OF THE COPPER-, ZINC-, IRON OXIDE SYSTEM AND THE COPPER-, CADMIUM IRON OXIDE SYSTEM CONTAINING A SMALL AMOUNT OF COBALT OXIDE, THE IRON OXIDE IN SAID FERRITE COMPRISING AT LEAST 50 MOL PERCENT OF THE COMPOSITION EXPRESSED AS METAL OXIDES AND CONTAINING ABOUT 62.5 TO 91% BY WEIGHT OF FERRIC OXIDE, ABOUT 1% TO 30% BY WEIGHT OF CUO, ABOUT 0.1 TO 5% BY WEIGHT OF COO, AND THE REMAINDER CONSISTING ESSENTIALLY
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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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |