Patent US3692744A successfully refreshed from Google Patents.
US3692744A
Expired / Lapsed
US
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Injection molded branched polyesters
Assignee: Rhodiaceta SA
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Filing: 1970-09-11
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Granted: 1972-09-19
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Expires: 1990-09-11
Abstract
Abstract Polyester moulding materials which can be injection moulded on a technical scale to give products having good mechanical properties are obtained by having present in the polyesterification mixture, besides a terephthalic or mainly terephthalic acid component and a diol component, 0.05-3 moles percent, on the acid component, of a compound containing at least 3, preferably 3 or 4, ester-forming groups this may for example be a tri- or tetra-carboxylic acid, a triol or tetrol, or a hydroxy carboxylic acid containing in all 3 or more ester-forming groups.
Inventors
- 👤 Rene Rich
- 👤 Yves Vaginay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:42
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; B; B29; B29C; B29C45/00; B29C45/0001; C08G63/60; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
39 words
A molded article according to claim 1, in which the diol component is selected from trimethylene glycol, tetramethylene glycol, and hexamethylene glycol, and the additional structural units are derived from trimesic acid, pyromellitic acid, trimethylolpropane, pentaerythritol or hydroxyterephthalic acid.
Claim 2
Dependent Claim
22 words
A molded article according to claim 1 in which the polyester contains 0.1 to 2.5 mol percent of said additional structural units.
Claim 3
Dependent Claim
22 words
A molded article according to claim 2, in which the polyester contains 0.1 to 1 mol percent of said addition structural units.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |