US3743707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing iron containing materials,including ferrites and oxyhydrates
Assignee: NEC Corp
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Filing: 1971-01-28
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Granted: 1973-07-03
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Expires: 1991-01-28
Abstract
Abstract A METHOD IS PROVIDED FOR THE EFFERVESCENT MIXING AND OXIDATION OF AQUEOUS SOLUTIONS CONTAINING A SUSPENSION OF IRON-CONTAINING PARTICLES CAPABLE OF DISSOLVING TO FORM HYDROXOFERROUS COMPLEX IONS. IN THE METHOD, A COLUMN OF AQUEOUS SOLUTION IS ESTABLISHED IN AN ELONGATED VESSEL CONTAINING A SUSPENSION OF IRON-CONTAINING PARTICLES WHILE MAINTAINING A FLOW OF OXIDIZING GAS FROM SAID GAS CHAMBER THROUGH SAID MULTI-PERFORATED PLATE TO EFFECT UNIFORM MIXING OF THE OXIDIZING GAS AND THE SOLUTION, THE FLOQ OF GAS BEING MAINTAINED TO PRODUCE A PRECIPITATE COMPRISED OF FERRIC IONS.
Inventors
- 👤 K Iwase
- 👤 T Takada
- 👤 M Kiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0053; B01J19/0066; C; C01; C01G; C01G49/00; C01G49/0018; C01G49/0063; C01G49/0072; C01G49/009; C01G49/02; C01G49/08; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/11; C01P2006/42; C01P2006/60; C01P2006/80
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |