US3423320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ferromagnetic chromium dioxide
Assignee: EIDP Inc
•
Filing: 1965-12-14
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Granted: 1969-01-21
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Expires: 1985-12-14
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Balthis Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:35
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; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/32; C01P2006/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE PROCESS OF PREPARING FERROMAGNETIC CHROMIUM DIOXIDE WHICH COMPRISES HEATING, AT A TEMPERATURE IN THE RANGE 325-500*C. AND UNDER A PRESSURE OF AT LEAST 250 ATMOSPHERES, AT LEAST ONE ALKALI METAL CHROMIUM OXIDE OF THE FORMULA MCR3O8 WHERE M IS SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM, RUBIDIUM AND CESIUM, WITH AT LEAST 10% BY WEIGHT, BASED ON THE WEIGHT OF MCR3O8, OF WATER.
Claim 2
Dependent Claim
66 words
THE PROCESS OF PREPARING FERROMAGNETIC CHROMIUM DIOXIDE WHICH COMPRISES HEATING, AT A TEMPERATURE IN THE RANGE 325-500*C. AND UNDER A PRESSURE OF AT LEAST 250 ATMOSPHERES, AT LEAST ONE ALKALI METAL CHROMIUM OXIDE OF THE FORMULA MCR3O8 WHERE M IS SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM, RUBIDIUM AND CESIUM, WITH AT LEAST 10% BY WEIGHT, BASED ON THE WEIGHT OF MCR3O8, OF WATER.
References Cited (Backward Citations)
US3117093A
Cited
US3243260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |