Patent US3756866A successfully refreshed from Google Patents.
US3756866A
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US
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Method and manufacturing magnetic alloy particles having selective coercivity
Assignee: International Business Machines Corp
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Filing: 1970-06-30
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Granted: 1973-09-04
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Expires: 1990-06-30
Abstract
Abstract MAGNETIC COBALT-PHOSPHORUS PARTICLES HAVING SELECTIVELY CONTROLLED HIGH COERCIVITY ARE PROVIDED BY CONTROLLING THE TEMPERATURE AT WHICH CHEMICAL DECOMPOSITION IS INITIATED IN A BASIC BATH OF THE COBALT CATION-HYPOPHOSPHITE ANION TYPE WHICH IS FREE OF STRONG COMPLEXING AGENTS AND IN WHICH THE SOURCE OF HYDROXYL IONS IS A NON-COMPLEXING BASE. BY CONTROLLING THE REACTION TEMPERATURE OF SUCH A SOLUTION, IN THE ABSENCE OF STRONG COMPLEXING AGENTS AND INCLUDING A NON-COMPLEXING BASE, SMALL UNIFORM COBALTPHOSPHORUS PARTICLES HAVING HIGH COERCIVITIES, IN THE RANGE OF 750 TO 1200 OERSTEDS, WITH A MARKED INVERSE DEPENDENCE UPON TEMPERATURE ARE OBTAINED.
Inventors
- 👤 C Parker
- 👤 R Polleys
- 👤 J Vranka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:07
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C; C01; C01B; C01B25/00; C01B25/06; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; G11B5/70621
Claims Analysis
Total Claims: 0
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |