US2868832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing acids from aqueous solutions with phosphate salts of quaternary ammonium anion exchange resins
Assignee: Dow Chemical Co
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Filing: 1957-05-23
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Granted: 1959-01-13
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Expires: 1977-05-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank C Taylor
- 👤 Hilmer L Aamoth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:27
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/04; B01J41/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD OF REMOVING A WATER-SOLUBLE ACID FROM AN AQUEOUS SOLUTION OF A NON-IONIZED WATER-SOLUBLE ORGANIC SOLUTE, WHICH METHOD COMPRISES BRINGING AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE NON-IONIZED WATER-SOLUBLE ORGANIC COMPOUND AND A WATER-SOLUBLE ACID HAVING AN IONIZATION CONSTANT GREATER THAN 4.8X10-13 AT 25* C. AS SOLUTES INTO CONTACT WITH PARTICLES OF AT LEAST ONE PHOSPHATE SALT FORM OF AN INSOLUBLE RESINOUS QUATERNARY AMMONIUM ANION EXCHANGE RESIN SELECTED FROM THE GROUP CONSISTING OF THE DIVALENT PHOSPHATE SALT FORM AND THE TRIVALENT PHOSPHATE SALT FORM OF SAID ANION EXCHANGE RESIN, AND SEPARATING THE SOLUTION FROM THE ANION EXCHANGE RESIN.
Claim 2
Independent Claim
99 words
A METHOD OF REMOVING A WATER-SOLUBLE ACID FROM AN AQUEOUS SOLUTION OF A NON-IONIZED WATER-SOLUBLE ORGANIC SOLUTE, WHICH METHOD COMPRISES BRINGING AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE NON-IONIZED WATER-SOLUBLE ORGANIC COMPOUND AND A WATER-SOLUBLE ACID HAVING AN IONIZATION CONSTANT GREATER THAN 4.8X10-13 AT 25* C. AS SOLUTES INTO CONTACT WITH PARTICLES OF AT LEAST ONE PHOSPHATE SALT FORM OF AN INSOLUBLE RESINOUS QUATERNARY AMMONIUM ANION EXCHANGE RESIN SELECTED FROM THE GROUP CONSISTING OF THE DIVALENT PHOSPHATE SALT FORM AND THE TRIVALENT PHOSPHATE SALT FORM OF SAID ANION EXCHANGE RESIN, AND SEPARATING THE SOLUTION FROM THE ANION EXCHANGE RESIN.
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |