Patent US3796691A successfully refreshed from Google Patents.
US3796691A
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Polyester condensation catalyzed by organotin,trivalent antimony and pentavalent phosphorus compounds
Assignee: Mitsubishi Chemical Corp
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Filing: 1971-09-23
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Granted: 1974-03-12
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Expires: 1991-09-23
Abstract
Abstract AN IMPROVED PROCESS FOR PRODUCING A LINEAR POLYESTER WHEREIN POLYCONDENSATION OF GLYCOL TEREPHTHALATE IS PER FORMED IN THE PRESENCE OF (1) A TRIVALENT ANTIMONY COMPOUND, (2) A PHOSPHORUS COMPOUND AND (3) AN ORGANOTI COMPOUND IN THE PROPORTIONS SATISFYING THE FOLLOWING ATOMIC RATIOS; SN/SB$0.2 AND P/SN$1. THE RESULTANT POLYESTER EXHIBITS EXCELLENT WHITENESS AND TRANSPARENCY AND THEREFORE, IS PARTICULARLY USEFUL FOR A TEXTILE FIBER AND FILM.
Inventors
- 👤 K Chimura
- 👤 S Takashima
- 👤 M Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87; C08G63/85; C08G63/86; C08G63/866; C08K; C08K5/00; C08K5/56; C08K5/57
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |