US3117093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of ferromagnetic chromium dioxide
Assignee: EIDP Inc
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Filing: 1960-10-24
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Granted: 1964-01-07
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Expires: 1980-10-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul Arthur
- 👤 John N Ingraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
PROCESS FOR THE PREPARATION OF FERROMAGNETIC CHROMIUM DIOXIDE WHICH COMPRISES HEATING AN INSOLUBLE OXIDE OF CHROMIUM, IN WHICH THE AVERAGE VALENCE OF CHROMIUM IS GREATER THAN 4 AND LESS THAN 6, IN THE PRESENCE OF A REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER AND AQUEOUS ACID, SAID REACTION MEDIUM BEING PRESENT IN AN AMOUNT SUFFICIENT TO FORM A FLUID SLURRY WITH SAID OXIDE, AT A TEMPERATURE IN THE RANGE OF 250 TO 500*C. AND UNDER A PRESSURE IN THE RANGE OF 50 TO 3000 ATMOSPHERES.
Claim 2
Dependent Claim
87 words
PROCESS FOR THE PREPARATION OF FERROMAGNETIC CHROMIUM DIOXIDE WHICH COMPRISES HEATING AN INSOLUBLE OXIDE OF CHROMIUM, IN WHICH THE AVERAGE VALENCE OF CHROMIUM IS GREATER THAN 4 AND LESS THAN 6, IN THE PRESENCE OF A REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER AND AQUEOUS ACID, SAID REACTION MEDIUM BEING PRESENT IN AN AMOUNT SUFFICIENT TO FORM A FLUID SLURRY WITH SAID OXIDE, AT A TEMPERATURE IN THE RANGE OF 250 TO 500*C. AND UNDER A PRESSURE IN THE RANGE OF 50 TO 3000 ATMOSPHERES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |