US3679398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of acicular,submicroscopic,permanently magnetizable metal particles
Assignee: Stamicarbon BV
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Filing: 1970-03-20
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Granted: 1972-07-25
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Expires: 1990-03-20
Abstract
Abstract THE PREPARATION OF ACICULAR COBALT-CONTAINING PERMANENTLY MAGNETIZABLE MATERIAL IS DESCRIBED WHEREIN THE PH VALUE OF A SOLUTION CONTAINING A COBALT SALT AND A FERROUS SALT, OR A COBALT SALT AND A NICKEL SALT OR A COMBINATION OF SAID THREE SALTS, IS HOMOGENEOUSLY INCREASED AT A CONTROLLED TEMPERATURE AND WITH AGITATION, FOLLOWING WHICH THE RESULTING PRECIPITATE IS THEN SUBJECTED TO A REDUCTIVE TREATMENT IN A SEPARATE LIQUID PHASE.
Inventors
- 👤 John W Geus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:06
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; C01B13/36; C01B13/363; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065; B22F2998/00; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10
Claims Analysis
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |