US3572993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrafine,nonpyrophoric,chi-iron carbide having high coercivity
Assignee: EIDP Inc
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Filing: 1968-07-23
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Granted: 1971-03-30
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Expires: 1988-07-23
Abstract
Abstract ULTRAFINE, NONPYROPHORIC, FERROMAGNETIC CHI-IRON CARBIDE HAVING HIGH INTRINSIC COERCIVITY IS PREPARED BY HEATING IRON CARBONYL IN CARBON MONOXIDE OR A MIXTURE OF CARBON MONOXIDE AND HYDROGEN AT A TEMPERATURE OF 280 TO 340*C. THIS CHI-IRON CARBIDE IS USEFUL AS A COMPONENT OF INKS, TONERS, AND MAGNETIC RECORDING MEMBERS FOR MAGNETIC RECORDING AND THE LIKE.
Inventors
- 👤 Donald Burl Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:31
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74; C01P2004/00; C01P2004/10; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/62; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/42; C01P2006/80; C01P2006/82
Claims Analysis
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |