US3663512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of high molecular weight polyesters for injection moulding purposes
Assignee: Hoechst AG
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Filing: 1970-07-01
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Granted: 1972-05-16
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Expires: 1990-07-01
Abstract
Abstract A PROCESS FOR THE PREPARATION OF LINEAR SATURATED POLYESTERS OF AROMATIC DICARBOXYLIC ACIDS AND SATURATED ALIPHATIC OR CYCLOALIPHATIC DIOLS, USING CARBOXYLIC ACID MANGANESE SALTS AS TRANSESTERIFICATION CATALYSTS, WHICH CONTAIN FROM 3 TO 20 CARBON ATOMS IN THE ANION AND AN EPOXY GROUP. THE SAID POLYESTERS ARE SUITABLE FOR INJECTIONMOULDING PURPOSES.
Inventors
- 👤 Rudolf Uebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/80
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |