US2923683A
Expired / Lapsed
US
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Antimony-modified chromium oxide ferromagnetic compositions, their preparation and use
Assignee: EIDP Inc
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Filing: 1957-06-19
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Granted: 1960-02-02
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Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 John N Ingraham
- 👤 Thomas J Swoboda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:45
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
39 words
AN ANTIMONY-MODIFIED CHROMIUM OXIDE FERROMAGNETIC COMPOSITION CONTAINING 42.5% TO 61.8% BY WEIGHT OF CHROMIUM COMBINED WITH OXYGEN AND 0.05% TO 25% BY WEIGHT OF ANTIMONY COMBINED WITH OXYGEN AND CONSISTING ESSENTIALLY OF SMALL ACICULAR PARTICLES OF TETRAGONAL CRYSTAL STRUCTURE.
Claim 2
Dependent Claim
39 words
AN ANTIMONY-MODIFIED CHROMIUM OXIDE FERROMAGNETIC COMPOSITION CONTAINING 42.5% TO 61.8% BY WEIGHT OF CHROMIUM COMBINED WITH OXYGEN AND 0.05% TO 25% BY WEIGHT OF ANTIMONY COMBINED WITH OXYGEN AND CONSISTING ESSENTIALLY OF SMALL ACICULAR PARTICLES OF TETRAGONAL CRYSTAL STRUCTURE.
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) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |