Patent US3842040A successfully refreshed from Google Patents.
US3842040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyesters
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-07-09
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Granted: 1974-10-15
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Expires: 1993-07-09
Abstract
Abstract 1. A PROCESS FOR THE MANUFACTURE OF A POLY(ALKYLENE ARYLENE DICARBOXYLATE) WHEREIN AN AROMATIC DICARBOXYLIC ACID IN THE PARTICULATE SOLID STATE IS REACTED WITH AN ESTER-FORMING DERIVATIVE OF A DIOL HAVING NO FREE HYDROXYL GROUPS TO FORM A POLY(ALKYLENE ARYLENE DICARBOXYLATE), WHEREIN REACTION CONDITIONS ARE SO CONTROLLED THAT THROUGHOUT THE REACTION A MAJOR PART OF THE RECATION MASS FORMS A PARTICULATE SOLID PHASE.
Inventors
- 👤 A Briarly
- 👤 J Mcintyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:33
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G63/785; C08G63/80; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE MANUFACTURE OF A POLY(ALKYLENE ARYLENE DICARBOXYLATE) WHEREIN AN AROMATIC DICARBOXYLIC ACID IN THE PARTICULATE SOLID STATE IS REACTED WITH AN ESTER-FORMING DERIVATIVE OF A DIOL HAVING NO FREE HYDROXYL GROUPS TO FORM A POLY(ALKYLENE ARYLENE DICARBOXYLATE), WHEREIN REACTION CONDITIONS ARE SO CONTROLLED THAT THROUGHOUT THE REACTION A MAJOR PART OF THE RECATION MASS FORMS A PARTICULATE SOLID PHASE.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE MANUFACTURE OF A POLY(ALKYLENE ARYLENE DICARBOXYLATE) WHEREIN AN AROMATIC DICARBOXYLIC ACID IN THE PARTICULATE SOLID STATE IS REACTED WITH AN ESTER-FORMING DERIVATIVE OF A DIOL HAVING NO FREE HYDROXYL GROUPS TO FORM A POLY(ALKYLENE ARYLENE DICARBOXYLATE), WHEREIN REACTION CONDITIONS ARE SO CONTROLLED THAT THROUGHOUT THE REACTION A MAJOR PART OF THE RECATION MASS FORMS A PARTICULATE SOLID PHASE.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |