Patent US3697487A successfully refreshed from Google Patents.
US3697487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of diluent in arylene sulfide polymer production
Assignee: Phillips Petroleum Co
•
Filing: 1971-05-05
•
Granted: 1972-10-10
•
Expires: 1991-05-05
Abstract
Abstract A POLAR ORGANIC DILUENT SELECTED FROM AMIDES AND SULFONES IS EXTRACTED FROM AN AQUEOUS REACTION MIXTURE SOLID SLURRY. IN THE PRODUCTION OF ARYLENE SULFIDE POLYMERS BY THE REACTION OF A POLYHALO-SUBSTITUTED AROMATIC COMPOUND WITH AN ALKALI METAL SULFIDE IN A POLAR ORGANIC DILUENT, THE POLAR ORGANIC DILUENT IS RECOVERED BY EXTRACTION WITH A SOLVENT OF THE AQUEOUS MIXTURE OF REACTION EFFLUENT SOLIDS AND POLAR ORGANIC DILUENT. IN A PREFERRED EMBODIMENT N-METHYL-2-PYRROLIDONE IS RECOVERED FROM THE AQUEOUS REACTION MIXTURE SOLID SLURRY BY EXTRACTION WITH A SOLVENT SUCH AS DICHLORMETHANE OR BENZENE.
Inventors
- 👤 Martin R Cines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:08
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0277; C08G75/0281; C08J; C08J11/00; C08J11/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |