US2568176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of dinitrile solvents
Assignee: Wyeth Holdings LLC
•
Filing: 1950-02-10
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Granted: 1951-09-18
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Expires: 1970-02-10
Abstract
No abstract record available.
Inventors
- 👤 Gerard N Vriens
- 👤 William E Sisco
- 👤 Eugene C Medcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:24
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS OF RECOVERING DINITRILE SOLVENTS SELECTED FROM THE GROUP CONSISTING OF BIS(LOWER CYANOALKYL)AMIDES, BIS(LOWER CYANOALKYL)ETHERS, BIS(LOWER CYANOALKYL)SULFIDES, FROM SOLUTIONS THEREIN OF MATERIALS HAVING NEGLIGIBLE WATER SOLUBILITY, WHICH COMPRISES CONTACTING THE SAID SOLUTIONS WITH AN INERT, SUBSTANTIALLY WATER-INSOLUBLE, EXTRACTANT FOR THE DISSOLVED MATERIAL, SAID EXTRACTANT HAVING SATURATED HYDROCARBON GROUPS AS ITS MAJOR CONSTITUENTS AND HAVING THE SOLVENT CHARACTERISTICS OF A SATURATED HYDROCARBON, AND WHICH HAS A BOILING POINT FAR REMOVED FROM THAT OF THE DISSOLVED MATERIAL AND DOES NOT FORM SUBSTANTIAL QUANTITIES OF AZEOTROPES THEREWITH SEPARATING THE SO EXTRACTED DINITRILE SOLVENT FROM THE EXTRACTED CONTAINING THE DISSOLVED MATERIAL EXTRACTED THEREBY AND SEPARATING THE DISSOLVED MATERIAL FROM THE EXTRACTED BY FRACTIONAL DISTILLATION.
Claim 2
Dependent Claim
111 words
A PROCESS OF RECOVERING DINITRILE SOLVENTS SELECTED FROM THE GROUP CONSISTING OF BIS(LOWER CYANOALKYL)AMIDES, BIS(LOWER CYANOALKYL)ETHERS, BIS(LOWER CYANOALKYL)SULFIDES, FROM SOLUTIONS THEREIN OF MATERIALS HAVING NEGLIGIBLE WATER SOLUBILITY, WHICH COMPRISES CONTACTING THE SAID SOLUTIONS WITH AN INERT, SUBSTANTIALLY WATER-INSOLUBLE, EXTRACTANT FOR THE DISSOLVED MATERIAL, SAID EXTRACTANT HAVING SATURATED HYDROCARBON GROUPS AS ITS MAJOR CONSTITUENTS AND HAVING THE SOLVENT CHARACTERISTICS OF A SATURATED HYDROCARBON, AND WHICH HAS A BOILING POINT FAR REMOVED FROM THAT OF THE DISSOLVED MATERIAL AND DOES NOT FORM SUBSTANTIAL QUANTITIES OF AZEOTROPES THEREWITH SEPARATING THE SO EXTRACTED DINITRILE SOLVENT FROM THE EXTRACTED CONTAINING THE DISSOLVED MATERIAL EXTRACTED THEREBY AND SEPARATING THE DISSOLVED MATERIAL FROM THE EXTRACTED BY FRACTIONAL DISTILLATION.
References Cited (Backward Citations)
US2439534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |