US3236807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing poly(unsymmetri-cally-2, 6-disubstituted phenylene) ether
Assignee: EIDP Inc
•
Filing: 1961-05-02
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Granted: 1966-02-22
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Expires: 1981-05-02
Abstract
No abstract record available.
Inventors
- 👤 Stamatoff Gelu Stoeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR THE PREPARATION OF A POLY(UNSYMMERTICALLY-DISUBSTITUTED PHENYLENE)ETHER HAVING AN INHERENT VISCOSITY, AS MEASURE DON A 0.5% SOLUTION IN BENZENE AT 25%C., OF GREATER THAN 0.5 WHICH COMPRISES ADMIXING AN AQUEOUS SOLUTION OF A PHENOLATE ION HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
41 words
A PROCESS FOR THE PREPARATION OF A POLY(UNSYMMERTICALLY-DISUBSTITUTED PHENYLENE)ETHER HAVING AN INHERENT VISCOSITY, AS MEASURE DON A 0.5% SOLUTION IN BENZENE AT 25%C., OF GREATER THAN 0.5 WHICH COMPRISES ADMIXING AN AQUEOUS SOLUTION OF A PHENOLATE ION HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US3134753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |