US3661862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyurethane mastics
Assignee: Rhone Poulenc SA
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Filing: 1969-03-11
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Granted: 1972-05-09
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Expires: 1989-03-11
Abstract
Abstract THE INVENTION PROVIDES A TWO-STAGE PROCESS FOR THE PREPARATION OF A POLYURETHANE MASTIC WHICH COMPRISES FIRST REACTING A MACRODIOL WITH A POLYISOCYANATE IN AN AMOUNT SUCH THAT THERE ARE 1 TO 2 ISOCYANATE GROUPS PER HYDROXYL GROUP TO PRODUCE AN ISOCYANATE TERMINATED PREPOLYMER AND THEN ADDING MORE POLYISOCYANATE.
Inventors
- 👤 Yves Bonin
- 👤 Jean Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/905; 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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |