Patent US3600315A successfully refreshed from Google Patents.
US3600315A
Expired / Lapsed
US
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Methods of manufacturing magnetic compositions of carbon modified chromium oxide
Assignee: International Business Machines Corp
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Filing: 1969-12-22
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Granted: 1971-08-17
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Expires: 1989-12-22
Abstract
Abstract THIS INVENTION RELATES TO THE FORMATION OF FERROMAGNETIC CHROMIUM OXIDE COMPOSITIONS CONTAINING 59% TO 62% CHROMIUM AND 0.05% TO 0.90% CARBON COMBINED WITH OXYGEN, AND IN THE FORM OF FINELY DIVIDED PARTICLES OF TETRAGONAL CRYSTALLINE STRUCTURE. THE PROCESS OF FORMING CARBON MODIFIED FERROMAGNETIC CHROMIUM OXIDE CONSISTS OF MIXING A SOLUBLE CHROMIUM HALIDE COMPOUND WITH AN ORGANIC COMPLEXING AGENT, ASSOCIATING THE COMPLEX WITH ADDITIOANL CHROMIUM COMPOUND, AND THEN SUBJECTING THE MIXTURE TO HEAT AND PRESSURE DECOMPOSITION.
Inventors
- 👤 Robert S Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:33
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; C01P2004/10; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 0
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |