US3798198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolytically stabilized polyurethanes
Assignee: Shoe and Allied Trades Research Association
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Filing: 1970-12-18
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Granted: 1974-03-19
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Expires: 1990-12-18
Abstract
Abstract PRODUCTS PARTLY OR WHOLLY COMPOSED OF POLYMERIC CONDENSATES, ESPECIALLY POLYURETHANE, AND STABILIZED AGAINST HYDROLYTIC DEGRADATION BY THE INCORPORATION OF A MINOR AMOUNT, NOT LESS THAN 1/2%, OF A STABILIZER SELECTED FROM CHELATING AGENTS, WEAK FREE ORGANIC ACIDS AND BUFFER SALTS. A PREFERRED STABILIZER IS ETHYLENE DIAMINE TETRAACETIC ACID (EDTA) OR A SOLUBLE SALT THEREOF, E.G. THE DISODIUM SALT. THE STABILIZATION IS PARTICULARLY EFFECTIVE WHEN THE PRODUCT INCORPORATES INORGANIC CATIONS SUCH AS RESIDUAL CATALYST. A PROCESS IN WHICH THE STABILIZER IS ADDED TO A SOLUTION OF THE POLYMERIC CONDENSATE WHICH IS SUBSEQUENTLY FORMED BY SOLUTION REMOVAL INTO A PRODUCT.
Inventors
- 👤 L Hole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/005; C08K5/16; C08K5/17; C08K5/175; Y; Y10; Y10S; Y10S521/00; Y10S521/901
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |