US3582266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing barium ferrite
Assignee: Merck and Co Inc
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Filing: 1968-09-24
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Granted: 1971-06-01
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Expires: 1988-09-24
Abstract
Abstract BARIUM FERRITE IS PREPARED BY REACTING A FERROUS SULFATE SOLUTION WITH A CARBONATE PRECIPITATING AGENT TO PRODUCE A FERROUS HYDROXYCARBONATE SLURRY WHICH IS FILTERED. BARIUM CARBONATE IS ADDED TO FORM A BARIUM-IRON CARBONATE COSLURRY WHICH IS DRIED AND CONVETED TO THE FERRITE BY CALCINATION. IN ANOTHER EMBODIMENT, BARIUM CHLORIDE IS ADDED TO THE FERROUS HYDROXYCARBONATE AND A CARBONATE ADDED TO PRECIPITATE BARIUM CARBONATE ON THE HYDROXYCARBONATE PARTICLES. THE ADDITION OF A CARBONATE TO A SOLUTION OF BARIUM CHLORIDE AND FERRIC CHLORIDE TO PRECIPITATE AN IRONBARIUM HYDROXYCARBONATE CO-PRECIPITATE IS ALSO DISCLOSED. CALCINATION OF THE CO-PRECIPITATE YIELDS BARIUM FERRITE.
Inventors
- 👤 Samuel W Sopp
- 👤 Leo F Heneghan
- 👤 Jack R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:11
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |