US3567525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treated ferromagnetic particles
Assignee: EIDP Inc
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Filing: 1968-06-25
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Granted: 1971-03-02
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Expires: 1988-06-25
Abstract
Abstract FERROMAGNETIC ALLOY PARTICLES OF IRON, NICKEL OR COBALT, AND OPTIONALLY CHROMIUM SUPERSATURATED WITH BORON, NITROGEN OR PHOSPHORUS WHICH ARE PREPARED BY REDUCTION OF A SOLUTION CONTAINING SALTS OF THE APPROPRIATE METALS, ARE CONVERTED TO POLYPHASE PARTICLES OF SUBSTANTIALLY UNCHANGED SIZE HAVING IMPROVED MAGNETIC PROPERTIES BY HEATING BELOW THEIR SINTERING TEMPERATURES. THE FERROMAGNETIC PARTICLES ARE USEFUL FOR MAKING MAGNETS AND FOR MAKING MAGNETIC RECORDING MEMBERS.
Inventors
- 👤 Arthur Hughes Graham
- 👤 Ernest Lewis Little Jr
- 👤 Jack D Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:21
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/09; H01F1/04; H01F1/06; H01F1/061
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |