US3342549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining phosphoric acid preparations
Assignee: Togo Soda Mfg Co Ltd
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Filing: 1965-12-21
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Granted: 1967-09-19
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Expires: 1985-12-21
Abstract
No abstract record available.
Inventors
- 👤 Sakomura Toshio
- 👤 Kikuchi Mitsuo
- 👤 Shimizu Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:53
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR REMOVING IRON AND ARSENIC FROM CRUDE PHOSPHORIC ACID, WHICH COMPRISES CHARGING SAID CRUDE PHOSPHORIC AID WITH HYDROCHLORIC ACID, MIXING STRONGLY BASIC ANION EXCHANGE RESIN WITH THE RESULTANT MIXTURE, SEPARATING THE STRONGLY BASIC ANION EXCHANGE RESIN CONTAINING SUBSTANTIALLY ALL THE IRON IMPURITY AND PART OF THE ARSENIC IMPURITY FROM THE PARTIALLY PURIFIED PHOSPHORIC ACID MIXTURE, AND CONCENTRATING SAID PARTIALLY PURIFIED PHOSPHORIC ACID MIXTURE BY EVAPORATION, THEREBY REMOVING SUBSTANTIALLY ALL THE HYDROCHLORIC ACID AND REMAINING ARSENIC BY EVAPORATION TO PRODUCE CONCENTRATED PHOSPHORIC ACID.
Claim 2
Dependent Claim
84 words
A PROCESS FOR REMOVING IRON AND ARSENIC FROM CRUDE PHOSPHORIC ACID, WHICH COMPRISES CHARGING SAID CRUDE PHOSPHORIC AID WITH HYDROCHLORIC ACID, MIXING STRONGLY BASIC ANION EXCHANGE RESIN WITH THE RESULTANT MIXTURE, SEPARATING THE STRONGLY BASIC ANION EXCHANGE RESIN CONTAINING SUBSTANTIALLY ALL THE IRON IMPURITY AND PART OF THE ARSENIC IMPURITY FROM THE PARTIALLY PURIFIED PHOSPHORIC ACID MIXTURE, AND CONCENTRATING SAID PARTIALLY PURIFIED PHOSPHORIC ACID MIXTURE BY EVAPORATION, THEREBY REMOVING SUBSTANTIALLY ALL THE HYDROCHLORIC ACID AND REMAINING ARSENIC BY EVAPORATION TO PRODUCE CONCENTRATED PHOSPHORIC ACID.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |