US3686031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal phosphate coated ferromagnetic chromium oxide and its preparation
Assignee: EIDP Inc
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Filing: 1969-11-26
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Granted: 1972-08-22
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Expires: 1989-11-26
Abstract
Abstract FERROMAGNETIC COMPOSITION OF IMPROVED STABILITY COMPRISING A FERROMAGNETIC CHROMIUM OXIDE SUBSTRATED COATED WITH A METAL PHOSPHATE SUCH AS ALUMINUM PHOSPHATE. PREPARATION OF THE ABOVE COMPOSITION BY SLURRING FERROMAGNETIC CHROMIUM OXIDE PARTICLES IN WATER AND PRECIPITATING THE METAL PHOSPHATE BY ADING TO THE SLURRY AT A TEMPERATURE OF 0*C.-100*C AND AT A PH OF 2.2-7.0 SOLUBLE PHOSPHATE OR ACIDS OF PENTAVALENT PHOSPHORUS AND SOLUBLE TRIVALENT ALUMINUM, TETRAVALENT ZIRCONIUM AND TITANIUM, AND DIVALENT LEAD SALTS OR METAL ALUMINATES OR PLUMBITES.
Inventors
- 👤 Joseph H Balthis Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636; C; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/12; C01P2006/42; C01P2006/80
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |