US3732182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing linear polyesters
Assignee: Mitsubishi Chemical Corp
•
Filing: 1971-04-20
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Granted: 1973-05-08
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Expires: 1991-04-20
Abstract
Abstract A PROCESS FOR PREPARING LINEAR POLYESTER WHEREIN POLYCONDENSATION OF GLYCOL TEREPHTHALATES IS PERFORMED IN THE PRESENCE OF A NOVEL CATALYTIC ATIMONY COMPOUND PREPARED FROM AN ANTIMONY COMPOUND HAVING THE FORMULA SB 7OR1) OR2) (OR3), SUCH AS SB ALKOXIDE, AND A-HYDROXYCARBOXYLIC ACID AND/OR A,B - DICARBOXYLIC ACID. RESULTANT POLYMERS EXHIBIT EXCELLENT WHITENESS AND TRANSPARENCY AND THEREFORE, ARE PARTICULARLY USEFUL FOR TEXTILE FIBERS AND FILMS.
Inventors
- 👤 K Chimura
- 👤 K Ito
- 👤 S Takashima
- 👤 Y Shimoshinbara
- 👤 M Shindo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/866
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |