Patent US2697725A successfully refreshed from Google Patents.
US2697725A
Expired / Lapsed
US
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Recovery of organic acids from aqueous solutions
Assignee: Sharples Corp
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Filing: 1950-03-18
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Granted: 1954-12-21
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Expires: 1970-03-18
Abstract
No abstract record available.
Inventors
- 👤 Hugh G Bryce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:19
CPC Classifications
B; B01; B01J; B01J41/00; C; C07; C07C; C07C51/00; C07C51/42; C07C51/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A PROCESS FOR RECOVERING ORGANIC ANIONS FROM AN AQUEOUS SOLUTION CONTAINING MINERAL ACID ANIONS AND ANIONS OF AN ORGANIC ACID OF THE GROUP CONSISTING OF ACETIC ACID, FORMIC ACID, BUTYRIC ACID, OXALIC ACID, SUCCINIC ACID, GLUTARIC ACID, TRICARBALLYLIC ACID, ACRYLIC ACID, MALEIC ACID, ACONITIC ACID, PHTHALIC ACID, BENZOIC ACID, MALIC ACID, ITACONIC ACID, CITRIC ACID, GLUTAMIC ACID, TARTARIC ACID, AND TRICHLOROACETIC ACID, THE STEPS WHICH COMPRISE MIXING WITH SAID SOLUTION IN ANIONIC EXCHANGE MATERIAL, AND BRINGING THE PH THROUGHOUT THE SOLUTION IN CONTACT WITH SAID ANIONIC EXCHANGE MATERIAL WITHIN THE RANGE OF FROM 4 TO 6 TO ABSORB ORGANIC ACID ANIONS ON SAID ANIONIC EXCHANGE MATERIAL.
Claim 2
Dependent Claim
107 words
IN A PROCESS FOR RECOVERING ORGANIC ANIONS FROM AN AQUEOUS SOLUTION CONTAINING MINERAL ACID ANIONS AND ANIONS OF AN ORGANIC ACID OF THE GROUP CONSISTING OF ACETIC ACID, FORMIC ACID, BUTYRIC ACID, OXALIC ACID, SUCCINIC ACID, GLUTARIC ACID, TRICARBALLYLIC ACID, ACRYLIC ACID, MALEIC ACID, ACONITIC ACID, PHTHALIC ACID, BENZOIC ACID, MALIC ACID, ITACONIC ACID, CITRIC ACID, GLUTAMIC ACID, TARTARIC ACID, AND TRICHLOROACETIC ACID, THE STEPS WHICH COMPRISE MIXING WITH SAID SOLUTION IN ANIONIC EXCHANGE MATERIAL, AND BRINGING THE PH THROUGHOUT THE SOLUTION IN CONTACT WITH SAID ANIONIC EXCHANGE MATERIAL WITHIN THE RANGE OF FROM 4 TO 6 TO ABSORB ORGANIC ACID ANIONS ON SAID ANIONIC EXCHANGE MATERIAL.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |