US3272737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of acids by dialysis with anion-exchange membranes
Assignee: Dow Chemical Co
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Filing: 1964-11-02
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Granted: 1966-09-13
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Expires: 1984-11-02
Abstract
No abstract record available.
Inventors
- 👤 Robert D Hansen
- 👤 Robert M Wheaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:13
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01J; B01J47/00; B01J47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN A DIALYSIS PROCESS FOR SEPARATING LOW MOLECULAR WEIGHT ACIDS IN AQUEOUS SOLUTION, THE IMPROVEMENT WHICH COMPRISES USING AN ANION-EXCHANGE MEMBRANE AS THE DIALYSIS MEMBRANE TO SEPARATE A STRONG ACID HAVING AN IONIZATION CONSTANT LESS THAN 1.0X10**-3 FROM A WEAK ACID HAVING AN IONIZATION CONSTANT GREATER THAN 1.X10**-3.
Claim 2
Dependent Claim
48 words
IN A DIALYSIS PROCESS FOR SEPARATING LOW MOLECULAR WEIGHT ACIDS IN AQUEOUS SOLUTION, THE IMPROVEMENT WHICH COMPRISES USING AN ANION-EXCHANGE MEMBRANE AS THE DIALYSIS MEMBRANE TO SEPARATE A STRONG ACID HAVING AN IONIZATION CONSTANT LESS THAN 1.0X10**-3 FROM A WEAK ACID HAVING AN IONIZATION CONSTANT GREATER THAN 1.X10**-3.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |