US3624181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyesters improved in dyeability
Assignee: Toyobo Co Ltd
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Filing: 1969-12-17
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Granted: 1971-11-30
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Expires: 1989-12-17
Abstract
Abstract IN WHICH R1 and R2 are each as defined above and p and q are each zero or a positive integer not more than 10, or blending the resultant polymer into linear fiber-forming polyesters. Process for preparing polyesters improved in dyeability with acid dyes which comprises polycondensing a dicarboxylic acid with a glycol, the whole or part of the glycol being the one represented by the formula: WHEREIN R1 and R2 are each a lower alkyl group or, when taken together, they represent a lower alkylene group, R3 is a lower alkyl group or a group of the formula: D R A W I N G
Inventors
- 👤 Hideaki Munakata
- 👤 Kazoo Watanabe
- 👤 Yoshikazu Arimatsu
- 👤 Masakazu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:46
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/34; D06P3/52; D06P3/521; C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856; C08L; C08L67/00; C08L67/02; C08L67/025
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
A blended polyester comprising a base polyester and the linear polyester according to claim 1, said base polyester being polyethylene terephthalate or a copolymer containing not less than 80 mol% of ethylene terephthalate unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |