US3696039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ferromagnetic chromium dioxide
Assignee: Bayer AG
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Filing: 1970-04-28
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Granted: 1972-10-03
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Expires: 1990-04-28
Abstract
Abstract A METHOD FOR THE PRODUCTION OF FERROMAGNETIC CHROMIUM DIOXIDE BY DEHYDRATING AND TAMPERING CHROMIUM OXIDE HYDRATE GREEN WHICH IS OBTAINED BY REDUCING A CHROMIUM (VI)-SOLUTION WITH A REDUCING ORGANIC SUBSTANCE AT A TEMPERATURE OF FROM 300* C. TO 400* C. AND AT A PRESSURE OF FROM 250 TO 30 KG./CM2. THE OBTAINED FINELY DIVIDED CHROMIUM OXIDE IN WHICH THE AVERAGE OXIDATION STATE OF THE CHROMIUM IS IN THE RANGE OF FROM 3 TO 4 IS HEATED TOGETHER WITH AN OXIDISING AGENT UNDER HYDROTHERMAL CONDITIONS AT A TEMPERATURE OF FROM 50* C. TO 400* C. AND AT A PRESSURE OF FROM 50 TO 500 KB./CM2, OPTIONALLY IN THE PRESENCE OF A SUBSTANCE, WHICH ACTS AS A MODIFIER.
Inventors
- 👤 Fritz Rodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636; B; B82; B82Y; B82Y30/00; C; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2004/00; C01P2004/20; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/42
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |