Patent US3725281A successfully refreshed from Google Patents.
US3725281A
Expired / Lapsed
US
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Ferromagnetic chromium dioxide
Assignee: Bayer AG
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Filing: 1970-12-28
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Granted: 1973-04-03
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Expires: 1990-12-28
Abstract
Abstract IN THE PRODUCTION OF FERROMAGENETIC CHROMIUM DIOXIDE WHEREIN A CHROMIUM AND OXYGEN CONTAINING COMPOUND IS TREATED HYDROTHERMALLY, THERE IS USED AS THE NUCLEATING AGENT A COMPOUND OF THE FORMULA A2TEO6 WHEREIN A IS ONE OR MORE OF CHROMIUM, IRON, ALUMINUM AND GALLIUM. THE PRODUCT IS CHARACTERIZED BY HIGH COERCIVITY AN EXCESS OF 400 (OE.) NOTWITHSTANDING THE USE OF RELATIVELY LITTLE TELLURIUM.
Inventors
- 👤 F Rodi
- 👤 F Hund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636
Claims Analysis
Total Claims: 0
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |