US3814736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane prepolymers having improved stability and method for their preparation
Assignee: Individual
•
Filing: 1973-02-01
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Granted: 1974-06-04
•
Expires: 1993-02-01
Abstract
Abstract POLYURETHANE PREPOLYMERS PREPARED BY THE REACTION OF POLYHYDROXYLATED COMPOUNDS WITH AN EXCESS OF ORGANIC POLYISOCYANATES IN WHICH PRIOR TO THE ADMIXTURE OF THE POLYHYDROXYLATED COMPOUNDS WITH THE POLYISOCYANATES, THE FORMER IS SUBJECTED TO A DEHYDRATION TO REDUCE THE RESIDUAL WATER CONTENT TO LESS THAN 5000 AND PREFERABLY LESS THAN 500 P.P.M. AND A SMALL AMOUNT OF A HIGHLY HYDROLYZABLE COMPOUND SUCH AS THE CHLORIDE OF BORON, ALUMINUM, TITANIUM AND SILICON IS ADDED AND IN WHICH THE COMPOSITION MAY INCLUDE VARIOUS ADHUVANTS SUCH AS FILLERS, PIGMENTS, COLORING AGENTS AND SOLVENTS WHICH ARE DEHYDRATED PRIOR TO ADMIXTURE.
Inventors
- 👤 Rambaud A Gibier
- 👤 B Blanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/088; C08G18/0885; C08G18/089; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/905
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |