US3753953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolysis-resistant polyesterurethane threads and preparation thereof
Assignee: Akzo NV
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Filing: 1971-06-11
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Granted: 1973-08-21
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Expires: 1991-06-11
Abstract
Abstract A METHOD FOR PRODUCING POLYESTER-URETHANE ELASTOMER THREADS IS DISCLOSED WHEREIN THE POLYESTER PORTION IS FORMED BY REACTING ADIPIC ACID WITH 2,2,4-TRIMETHYLHEXANEDIOL-1,6 AND/OR 2,4,4-TRIMETHYLHEXANEDIOL-1,6. THERESULTING PRDUCTS HAVE EXCELLENT MECHANICAL PROPERTIES AND A VERY HIGH HYDROLYTIC STABILITY.
Inventors
- 👤 C Vrouenraets
- 👤 C Leeuwerik
- 👤 F Huntjens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; Y; Y10; Y10S; Y10S528/00; Y10S528/906
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |