Patent US2750412A successfully refreshed from Google Patents.
US2750412A
Expired / Lapsed
US
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Alcohol recovery of organic acids and salts thereof
Assignee: Crossett Lumber Co
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Filing: 1952-11-03
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Granted: 1956-06-12
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Expires: 1972-11-03
Abstract
No abstract record available.
Inventors
- 👤 Lloyd T Sandborn
- 👤 William B Stengle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:13
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE PROCESS OF SEPARATING FROM A CONCENTRATE OF THE LIQUOR RESULTING FROM AN ALKALINE COOK OF CELLULOSIC MATERIAL, FORMIC, ACETIC, LACTIC AND GLYCOLIC ACIDS AND THE SODIUM SALTS OF SAID ACIDS, WHICH COMPRISES CONTACTING THE CONCENTRATE WITH A SOLVENT FOR SAID SALTS, THE SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, AND PROPANOL, A MIXTURE OF METHANOL AND ETHANOL, A MIXTURE OF AT LEAST ONE OF PROPANOL AND BUTANOL WITH METHANOL, AND A MIXTURE OF AT LEAST ONE OF PROPANOL AND BUTANOL WITH ETHANOL; FILTERING THE SOLVENT, CONTAINING SAID SALTS, FROM THE REMAINDER OF THE CONCENTRATE; REMOVING FROM THE FILTRATE THE SOLVENT EMPLOYED AND THEREBY LEAVING A MIXTURE OF SAID SALTS IN AQUEOUS SOLUTION.
Claim 2
Dependent Claim
116 words
THE PROCESS OF SEPARATING FROM A CONCENTRATE OF THE LIQUOR RESULTING FROM AN ALKALINE COOK OF CELLULOSIC MATERIAL, FORMIC, ACETIC, LACTIC AND GLYCOLIC ACIDS AND THE SODIUM SALTS OF SAID ACIDS, WHICH COMPRISES CONTACTING THE CONCENTRATE WITH A SOLVENT FOR SAID SALTS, THE SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, AND PROPANOL, A MIXTURE OF METHANOL AND ETHANOL, A MIXTURE OF AT LEAST ONE OF PROPANOL AND BUTANOL WITH METHANOL, AND A MIXTURE OF AT LEAST ONE OF PROPANOL AND BUTANOL WITH ETHANOL; FILTERING THE SOLVENT, CONTAINING SAID SALTS, FROM THE REMAINDER OF THE CONCENTRATE; REMOVING FROM THE FILTRATE THE SOLVENT EMPLOYED AND THEREBY LEAVING A MIXTURE OF SAID SALTS IN AQUEOUS SOLUTION.
References Cited (Backward Citations)
US431243A
Cited
US1177746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |