US3068176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic chromium oxides containing fluorine and their preparation
Assignee: EIDP Inc
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Filing: 1958-03-31
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Granted: 1962-12-11
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Expires: 1978-03-31
Abstract
No abstract record available.
Inventors
- 👤 John N Ingraham
- 👤 Thomas J Swoboda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A FERROMAGNETIC CHORMIUM OXIDE HAVING A TETRAGONAL CRYSTAL STRUCTURE AND CONSISTING OF 48.0 TO 61.8% BY WEIGHT CHROMIUM, AS A PRIMARY MODIFIER 0.1 TO 5.0% BY WEIGHT FLUORINE, AND AS A SECONDARY MODIFIER FROM 0 TO 14.0% BY WEIGHT OF AN OXIDE OF A MEMBER OF THE GROUP CONSISTING OF IRON, ANTIMONY, COBALT, NICKEL, MANGANESE, VANADIUM, RUTHENIUM, AND ALKALI METALS, THE REMAINDER OF SAID FERROMAGNETIC CHROMIUM OXIDE BEING OXYGEN.
References Cited (Backward Citations)
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US2736708A
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GB697219A
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GB737284A
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US2770523A
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FR1154191A
Cited
US2885365A
Cited
US2923683A
Cited
US2893830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-10 | 1966-06-11 | 1966-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-10 | 1970-06-11 | 1970-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-10 | 1974-06-11 | 1974-12-11 | $7700.00 | Window Closed / Lapsed |