US3046158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing magnetic material
Assignee: Fujifilm Holdings Corp
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Filing: 1959-11-27
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Granted: 1962-07-24
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Expires: 1979-11-27
Abstract
No abstract record available.
Inventors
- 👤 Fukuda Shinro
- 👤 Goto Hiroshi
- 👤 Miyake Toknaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:15
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PRODUCING MAGNETIC MATERIALS OF A FORM WHEREBY THE LENGTH IS GREATER THAN THE WIDTH COMPRISING ADDING PARTICLES SELECTED FROM THE GROUP CONSISTING OF ZINC OXIDE AND FERRIC OXIDE HYDRATE HAVING A LENGTH LESS THAN ABOUT 6U IN A CRYSTAL FORM HAVING A LENGTH TO WIDTH RATIO OF ABOUT 6:1 TO A SOLUTION OF AN IRON SALT HAVING FERRIC AND FERROUS IONS THEREIN IN THE PROPORTIONS NECESSARY TO FORM MAGNETIC, ADDING ALKALI TO THE SOLUTION TO PRECIPITATE THE MIXED HYDRATED FERROUS AND FERRIC OXIDES, AGITATING THE SOLUTION, AND ALLOWING THE SOLUTION TO STAND SO AS TO DEPOSIT THE MIXED OXIDES ON THE PARTICLES.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PRODUCING MAGNETIC MATERIALS OF A FORM WHEREBY THE LENGTH IS GREATER THAN THE WIDTH COMPRISING ADDING PARTICLES SELECTED FROM THE GROUP CONSISTING OF ZINC OXIDE AND FERRIC OXIDE HYDRATE HAVING A LENGTH LESS THAN ABOUT 6U IN A CRYSTAL FORM HAVING A LENGTH TO WIDTH RATIO OF ABOUT 6:1 TO A SOLUTION OF AN IRON SALT HAVING FERRIC AND FERROUS IONS THEREIN IN THE PROPORTIONS NECESSARY TO FORM MAGNETIC, ADDING ALKALI TO THE SOLUTION TO PRECIPITATE THE MIXED HYDRATED FERROUS AND FERRIC OXIDES, AGITATING THE SOLUTION, AND ALLOWING THE SOLUTION TO STAND SO AS TO DEPOSIT THE MIXED OXIDES ON THE PARTICLES.
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) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |