US3067007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of strong polybasic acids from their salts
Assignee: Dow Chemical Co
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Filing: 1960-01-27
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Granted: 1962-12-04
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Expires: 1980-01-27
Abstract
No abstract record available.
Inventors
- 👤 Melvin J Hatch
- 👤 Jr John A Dillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:12
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/20; B01J41/04; B01J41/05; C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A METHOD FOR SEPARATING FROM ONE ANOTHER A STRONG POLYBASIC ACID WHICH HAS A FIRST IONIZATION CONSTANT NOT LESS THAN 1X10-3 AND A CONVENTIONAL WATER-SOLUBLE SALT OF THE SAID POLYBASIC ACID BY FEEDING TO A BED OF AN ANION EXCHANGE RESIN, HAVING A MONOVALENT ANION INDENTICAL WITH THAT OF SAID ACID AND IMMERSED IN AN AQUEOUS LIQUID OF THE GROUP CONSISTING OF WATER AND DILUTE AQUEOUS SOLUTIONS OF SAID POLYBASIC ACID HAVING AN ASCID CONCENTRATION LESS THAN THAT IN THE FEED SOLUTION, AN AQUEOUS SOLUTION OF SAID ACID AND SAID SALT WHICH SOLUTION IS AT LEAST 0.5 NORMAL IN SAID ACID, THUS DISPLACING AQUEOUS LIQUID FROM THE RESIN BED, THEREAFTER FEEDING AQUEOUS RINSING SOLUTION TO THE BED TO DISPLACE A FURTHER AMOUNT OF RESIDUAL LIQUID FROM THE BED, AND COLLECTING SUCCESSIVE FRACTIONS OF THE DISPLACED EFFLUENT LIQUID WHEREBY THERE IS OBTAINED AN EARLY
Claim 2
Independent Claim
143 words
A METHOD FOR SEPARATING FROM ONE ANOTHER A STRONG POLYBASIC ACID WHICH HAS A FIRST IONIZATION CONSTANT NOT LESS THAN 1X10-3 AND A CONVENTIONAL WATER-SOLUBLE SALT OF THE SAID POLYBASIC ACID BY FEEDING TO A BED OF AN ANION EXCHANGE RESIN, HAVING A MONOVALENT ANION INDENTICAL WITH THAT OF SAID ACID AND IMMERSED IN AN AQUEOUS LIQUID OF THE GROUP CONSISTING OF WATER AND DILUTE AQUEOUS SOLUTIONS OF SAID POLYBASIC ACID HAVING AN ASCID CONCENTRATION LESS THAN THAT IN THE FEED SOLUTION, AN AQUEOUS SOLUTION OF SAID ACID AND SAID SALT WHICH SOLUTION IS AT LEAST 0.5 NORMAL IN SAID ACID, THUS DISPLACING AQUEOUS LIQUID FROM THE RESIN BED, THEREAFTER FEEDING AQUEOUS RINSING SOLUTION TO THE BED TO DISPLACE A FURTHER AMOUNT OF RESIDUAL LIQUID FROM THE BED, AND COLLECTING SUCCESSIVE FRACTIONS OF THE DISPLACED EFFLUENT LIQUID WHEREBY THERE IS OBTAINED AN EARLY
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) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |