US3133899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyarylethers
Assignee: Millennium Petrochemicals Inc
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Filing: 1960-10-12
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Granted: 1964-05-19
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Expires: 1980-10-12
Abstract
No abstract record available.
Inventors
- 👤 Kwiatek Jack
- 👤 Jay K Seyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:14
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR PREPARATION OF POLYMERIC ARYL ETHERS WHICH COMPRISES CONTACTING A SOLUTION CONTAINING A THIOBISPHENOL, PYRIDINE AND COPER CHLORIDE WITH A FREE OXYGEN-CONTAINING GAS, SAID THIOBISPHENOL HAVING THE FORMULA HO-(2,6-DI(R-)-1,4-PHENYLENE)-S-(3,5-DI(R-)-1,4PHENYLENE)-OH WHEREIN AT LEAST ONE R IN EACH PHENOL GROUP IS AN ALKYL GROUP OF 1 TO 3 CARBON ATOMS AND THE REMAINING R IN EACH PHENOL GROUP IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL GROUP OF 1 TO 3 CARBON ATOMS TO PRODUCE BY OXIDATIVE COUPLING A LINEAR POLYPHENYLENE ETHER.
Claim 2
Dependent Claim
85 words
A PROCESS FOR PREPARATION OF POLYMERIC ARYL ETHERS WHICH COMPRISES CONTACTING A SOLUTION CONTAINING A THIOBISPHENOL, PYRIDINE AND COPER CHLORIDE WITH A FREE OXYGEN-CONTAINING GAS, SAID THIOBISPHENOL HAVING THE FORMULA HO-(2,6-DI(R-)-1,4-PHENYLENE)-S-(3,5-DI(R-)-1,4PHENYLENE)-OH WHEREIN AT LEAST ONE R IN EACH PHENOL GROUP IS AN ALKYL GROUP OF 1 TO 3 CARBON ATOMS AND THE REMAINING R IN EACH PHENOL GROUP IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL GROUP OF 1 TO 3 CARBON ATOMS TO PRODUCE BY OXIDATIVE COUPLING A LINEAR POLYPHENYLENE ETHER.
References Cited (Backward Citations)
US2837573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |