US3562769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of phosphoric acid
Assignee: Mizusawa Industrial Chemicals Ltd
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Filing: 1968-05-14
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Granted: 1971-02-09
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Expires: 1988-05-14
Abstract
Abstract A PROCESS FOR THE PREPARATION OF PHOSPHORIC ACID WHICH COMPRISES ADDING AT LEAST ONE DISINTEGRATION-PREVENTING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SALTS AND AMORPHOUS SILICA AND SULFURIC ACID TO CALCIUM PHOSPHATE OR PHOSPHATE ROCK, HEATING THE RESULTANT MIXTURE OF 100-300*C. TO CONVERT THE SAME TO PREFECTLY SOLID, NON-DISINTEGRABLE SMALL MASSES, AND THEREAFTER EXTRACTING THE PHOSPHORIC ACID COMPONENT FROM THE MASSES.
Inventors
- 👤 Yujiro Sugahara
- 👤 Hiroyuki Naito
- 👤 Masahide Ogawa
- 👤 Jinichi Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; C01B25/222; C01B25/232
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |