US3672867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submicron ferromagnetic alloy particles containing cobalt,boron,and zinc
Assignee: EIDP Inc
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Filing: 1970-12-07
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Granted: 1972-06-27
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Expires: 1990-12-07
Abstract
Abstract SUBMICRON PARTICLES, USEFUL IN MAGNETIC APPLICATIONS, CONSISTING ESSENTIALLY OF COBALT, ZINC, AND BORON IN 70-92 TO 1-8 TO 1-5.6 WEIGHT RATIO AND UP TO 22 PERCENT BY WEIGHT WATER AND OXYGEN, ARE PREPARED BY REDUCING CO2+ IN SOLUTIONS CONTAINING ZN2+ BY MEANS OF SELECTED BOROHYDRIDES AND PREFERABLY HEAT-TREATING THE PRODUCTS IN HYDROGEN. AFTER HEAT TREATMENT SUBSTANTIAL QUANTITIES OF HEXAGONAL CLOSE-PACKED COBALT MAY BE DETECTED BY X-RAY DIFFRACTION. THE PARTICLES ARE USEFUL IN A VARIETY OF MAGNETIC APPLICATIONS, E,G., IN MAGNETIC RECORDING TAPES, IN BAR MAGNETS AND THE LIE.
Inventors
- 👤 Ernest Lewis Little Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:06
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; B; B22; B22F; B22F1/00; B22F1/05; B22F1/054; B22F9/00; B22F9/16; B22F9/18; B22F9/24; B82; B82Y; B82Y30/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |