US2664441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of organic acids
Assignee: Individual
•
Filing: 1951-07-19
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Granted: 1953-12-29
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Expires: 1971-07-19
Abstract
No abstract record available.
Inventors
- 👤 Harry S Owens
- 👤 John B Stark
- 👤 Alan E Goodban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:22
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28; C07C; C07C51/00; C07C51/42; C07C51/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR SEPARATING AN ACID OF THE GROUP CONSISTING OF ACETIC ACID, LACTIC ACID, GLYCOLIC ACID, SUCCINIC ACID, PYRROLIDONE CARBOXYLIC ACID, MALIC ACID, CITRIC ACID, AND OXALIC ACID FROM ITS MIXTURE WITH AT LEAST ONE OTHER ACID OF SAID GROUP WHICH COMPRISES ADSORBING SUCH A MIXTURE OF ACIDS ON AN ANION EXCHANGE BED WHICH HAS BEEN CONDITIONED WITH AN ACID WHICH IS STRONGER THAN THE ACIDS TO BE SEPARATED THE PH OF THE CONDITIONED EXCHANGER BEING ABOUT 1 TO 1.5 PH UNITS LESS THAN THE PK OF THE WEAKEST ACID CONTAINED IN SAID MIXTURE, THEN ELUTING THE EXCHANGER WITH A SOLUTION OF A STRONGER MINERAL ACID.
Claim 2
Dependent Claim
107 words
A PROCESS FOR SEPARATING AN ACID OF THE GROUP CONSISTING OF ACETIC ACID, LACTIC ACID, GLYCOLIC ACID, SUCCINIC ACID, PYRROLIDONE CARBOXYLIC ACID, MALIC ACID, CITRIC ACID, AND OXALIC ACID FROM ITS MIXTURE WITH AT LEAST ONE OTHER ACID OF SAID GROUP WHICH COMPRISES ADSORBING SUCH A MIXTURE OF ACIDS ON AN ANION EXCHANGE BED WHICH HAS BEEN CONDITIONED WITH AN ACID WHICH IS STRONGER THAN THE ACIDS TO BE SEPARATED THE PH OF THE CONDITIONED EXCHANGER BEING ABOUT 1 TO 1.5 PH UNITS LESS THAN THE PK OF THE WEAKEST ACID CONTAINED IN SAID MIXTURE, THEN ELUTING THE EXCHANGER WITH A SOLUTION OF A STRONGER MINERAL ACID.
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) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |