US3243375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precipitation process for preparing acicular magnetic metal oxide particles
Assignee: 3M Co
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Filing: 1962-11-07
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Granted: 1966-03-29
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Expires: 1982-11-07
Abstract
No abstract record available.
Inventors
- 👤 Johannes C Jeschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70652; G11B5/70668; G11B5/70673; C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54; C01P2004/00; C01P2004/10; C01P2004/54; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A PROCESS FOR THE PREPARATION OF ACIDULAR MAGNETIC PARTICLES OF ADJUVANT METAL-DOPED V-FE2O3 BY COPRECIPITATION OF THE MIXED OXIDES OF IRON AND DOPING METALS FROM A SALT SOLUTION OF THE METAL IONS, AND REDUCTION AND REOXIDATION OF NON-MAGNETIC MIXED OXIDES OF IRON AND DOPING METAL, THE STEP WHICH COMPRISES ADDING ABOUT 0.5 TO 2 MOLES OF THIOSULFATE OF THE CLASS CONSISTING OF ALKALI METAL THIOSULFATE AND AMMONIUM THIOSULFATE, AND ABOUT 0.1 TO 0.5 MOLE OF ALKALI METAL IODATE, IN AQUEOUS SOLUTION, TO AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 0.25 TO 1 MOLE PER LITER OF FERROUS SULFATE AND ABOUT 0.1 TO 10 MOLE PERCENT, BASED ON THE AMOUNT OF IRON, OF WATER-SOLUBLE ADJUVANT METAL SALT, AT A TEMPERATURE IN THE RANGE OF ABOUT 50* TO 80*C., TO OXIDIZE AND COPRECIPITATE THE IRON AND ADJUVANT METAL AS HYDRATED NON-MAGNETIC MIXED OXIDES.
Claim 2
Dependent Claim
141 words
IN A PROCESS FOR THE PREPARATION OF ACIDULAR MAGNETIC PARTICLES OF ADJUVANT METAL-DOPED V-FE2O3 BY COPRECIPITATION OF THE MIXED OXIDES OF IRON AND DOPING METALS FROM A SALT SOLUTION OF THE METAL IONS, AND REDUCTION AND REOXIDATION OF NON-MAGNETIC MIXED OXIDES OF IRON AND DOPING METAL, THE STEP WHICH COMPRISES ADDING ABOUT 0.5 TO 2 MOLES OF THIOSULFATE OF THE CLASS CONSISTING OF ALKALI METAL THIOSULFATE AND AMMONIUM THIOSULFATE, AND ABOUT 0.1 TO 0.5 MOLE OF ALKALI METAL IODATE, IN AQUEOUS SOLUTION, TO AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 0.25 TO 1 MOLE PER LITER OF FERROUS SULFATE AND ABOUT 0.1 TO 10 MOLE PERCENT, BASED ON THE AMOUNT OF IRON, OF WATER-SOLUBLE ADJUVANT METAL SALT, AT A TEMPERATURE IN THE RANGE OF ABOUT 50* TO 80*C., TO OXIDIZE AND COPRECIPITATE THE IRON AND ADJUVANT METAL AS HYDRATED NON-MAGNETIC MIXED OXIDES.
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |