Patent US2011465A successfully refreshed from Google Patents.
US3822239A
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Process for preparing linear polyesters
Assignee: Mitsubishi Chemical Corp
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Filing: 1971-05-03
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Granted: 1974-07-02
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Expires: 1991-05-03
Abstract
Abstract A PROCESS FOR PREPARING LINEAR POLYESTERS WHEREIN POLYCONDENSATION OF GLYCEROL TEREPHTHALATES IS PERFORMED IN THE PRESENCE OF ANTIMONY-CONTAINING CATALYST AND A COMPOUND SELECTED FROM A-HYDROXYCARBOXYLIC ACID; A,B-DICARBOXYLIC ACID; SULFUR-CONTAINING DERIVATIVE OF A-HYDROXYCARBOXYLIC ACID OR A,B-DICARBOXYLIC ACID; AND DERIVATIVES THEREOF SUCH AS ESTER, AMIDE, ACID ANHYDRIDE, MIXED ACID ANHYDRIDE OR ACID HALIDE. RESULTANT POLYESTERS, EXHIBIT EXCELLENT WHITENESS AND TRANSPARENCY AND THEREOF, ARE PARTICULARLY USEFUL FOR TEXTILE FIBERS AND FILMS.
Inventors
- 👤 K Chimura
- 👤 M Shindo
- 👤 Y Shimoshinbara
- 👤 K Ito
- 👤 S Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/866; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; C08G63/87
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |