Patent US3425666A successfully refreshed from Google Patents.
US3425666A
Expired / Lapsed
US
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Process for producing ferrimagnetic materials
Assignee: Chevron USA Inc
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Filing: 1963-02-21
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Granted: 1969-02-04
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Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 Robert H Lindquist
- 👤 Bernard F Mulaskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678; G11B5/84; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/083; H01F1/10; H01F1/11; H01F1/112; H01F1/0009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS OF MANUFACTURING A MATERIAL, A MASS OF FINELY DIVIDED PARTICLES OF WHICH AN APPLIED MAGNETIC FIELD CAN INDUCE TO CHANGE FROM A NONMAGNETIZED CONDITION, IN THE SENSE OF EXHIBITING NO NET EXTERNAL FIELD, TO A MAGNETIZED CONDITION, IN THE SENSE OF EXHIBITING AN EXTERNAL FIELD, WHICH COMPRISES REACTING STARTING MATERIALS COMPRISING A SALT OF A FIRST METAL IN THE DIVALENT STATE, A SALT OF IRON IN THE TRIVALENT STATE, AND AN EPOXY COMPOUND TO OBTAIN A MIXTURE COMPRISING A METAL HYDROXIDE-CONTAINING GEL, AND BEATING SAID MIXTURE TO PRODUCE THE DESIRED COMPOSITION.
Claim 2
Dependent Claim
93 words
THE PROCESS OF MANUFACTURING A MATERIAL, A MASS OF FINELY DIVIDED PARTICLES OF WHICH AN APPLIED MAGNETIC FIELD CAN INDUCE TO CHANGE FROM A NONMAGNETIZED CONDITION, IN THE SENSE OF EXHIBITING NO NET EXTERNAL FIELD, TO A MAGNETIZED CONDITION, IN THE SENSE OF EXHIBITING AN EXTERNAL FIELD, WHICH COMPRISES REACTING STARTING MATERIALS COMPRISING A SALT OF A FIRST METAL IN THE DIVALENT STATE, A SALT OF IRON IN THE TRIVALENT STATE, AND AN EPOXY COMPOUND TO OBTAIN A MIXTURE COMPRISING A METAL HYDROXIDE-CONTAINING GEL, AND BEATING SAID MIXTURE TO PRODUCE THE DESIRED COMPOSITION.
References Cited (Backward Citations)
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US2739044A
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US3029160A
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US3100194A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |