Patent US3244620A successfully refreshed from Google Patents.
US3244620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of acid from polymers by dialysis with anion-exchange membranes
Assignee: Dow Chemical Co
•
Filing: 1964-11-02
•
Granted: 1966-04-05
•
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
2026-10-29 16:31
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/28; B01D71/281; B01D61/00; B01D61/24; B01D61/243; B01D71/08; B01D71/12; B01D71/40; B01D71/401; B01D71/403; B01J; B01J47/00; B01J47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN A DIALYSIS PROCESS FOR THE SEPARATION OF A STRONG ACID CHARACTERIZED BY A MOLECULAR WEIGHT LESS THAN 200 AND AN IONIZATION CONSTANT GREATER THAN 1.0X10**3 FROM AN AQUEOUS MIXTURE WITH A POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 400, THE IMPROVEMENT WHICH COMPRISES USING AN ANION-EXCHANGE MEMBRANE AS THE DIALYSIS MEMBRANE AND THEREBY RECOVERING AN ESSENTIALLY UNDILUTED DIALYSATE ELUENT CONTAINING A REDUCED CONCENTRATION OF ACID.
Claim 2
Dependent Claim
68 words
IN A DIALYSIS PROCESS FOR THE SEPARATION OF A STRONG ACID CHARACTERIZED BY A MOLECULAR WEIGHT LESS THAN 200 AND AN IONIZATION CONSTANT GREATER THAN 1.0X10**3 FROM AN AQUEOUS MIXTURE WITH A POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 400, THE IMPROVEMENT WHICH COMPRISES USING AN ANION-EXCHANGE MEMBRANE AS THE DIALYSIS MEMBRANE AND THEREBY RECOVERING AN ESSENTIALLY UNDILUTED DIALYSATE ELUENT CONTAINING A REDUCED CONCENTRATION OF ACID.
References Cited (Backward Citations)
US2433879A
Cited
US2681319A
Cited
US2772237A
Cited
US2972586A
Cited
US2883349A
Cited
US3132095A
Cited
US3003940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |