Patent US3759855A successfully refreshed from Google Patents.
US3759855A
Expired / Lapsed
US
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Polyesters having improved stretchability and dyeability properties
Assignee: Bayer AG
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Filing: 1971-04-15
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Granted: 1973-09-18
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Expires: 1991-04-15
Abstract
Abstract IMPROVED STRETCHABILITY AND DYEABILITY PROPERTIES ARE SHOWN BY NOVEL TEREPHTHALIC ACID POLYESTERS HAVING MELT VISOSITIES OF FROM 500 TO 20,000 POISES AT 280*C., AND COMPRISING RECURRING ALKYLENE DIOL TEREPHTHALATE UNITS, AND OF 0.02 TO 12 MOL PERCENT OF UNITS CONTAINING POLYOL RADICALS THAT ARE PARTIALLY ESTERIFIED WITH FATTY ACIDS, AND CORRESPONDING TO THE GENERAL FORMULA -CO-(1,4-PHENYLENE)-COO-R2(-(OOC-R3)N)-O- IN WHICH R2 REPRESENTS A LINEAR OR BRANCHED ALIPHATIC OR HYDROAROMATIC RADICAL HAVING A FUNCTIONALITY OF 2+N, R3 REPRESENTS HYDROGEN OR A C1-C19 ALKYL RADICAL, AND N REPRESENTS AN INTEGER FROM 1 TO 6.
Inventors
- 👤 R Schnegg
- 👤 H Pelousek
- 👤 R Dippelhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:19
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/21; Y10S8/00; Y10S8/04
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |