Patent US3297401A successfully refreshed from Google Patents.
US3297401A
Expired / Lapsed
US
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Process for refining phosphoric acid preparations
Assignee: Organo Corp
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Filing: 1965-12-21
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Granted: 1967-01-10
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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
2026-11-05 08:23
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
69 words
A PROCESS FOR REMOVING IRON AND ARSENIC FROM CRUDE PHOSPHORIC ACID, WHICH COMPRISES CHARGING SAID CRUDE PHOSPHORIC ACID WITH HYDROCHLORIC ACID, MIXING WEAKLY BASIC LIQUID ANION EXCHANGER WITH THE RESULTANT MIXTURE, SEPARATING THE WEEKLY BASIC LIQUID ANION EXCHANGER 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
Claim 2
Dependent Claim
69 words
A PROCESS FOR REMOVING IRON AND ARSENIC FROM CRUDE PHOSPHORIC ACID, WHICH COMPRISES CHARGING SAID CRUDE PHOSPHORIC ACID WITH HYDROCHLORIC ACID, MIXING WEAKLY BASIC LIQUID ANION EXCHANGER WITH THE RESULTANT MIXTURE, SEPARATING THE WEEKLY BASIC LIQUID ANION EXCHANGER 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
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |