US3631199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyether diisocyanates
Assignee: 3M Co
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Filing: 1967-03-20
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Granted: 1971-12-28
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Expires: 1987-03-20
Abstract
Abstract A POLYETHER DIISOCYANATE HAVING THE FORMULA OCN(RO)NRNCO IN WHICH AT LEAST 60 PERCENT OF SAID R RADICALS ARE TETRAMETHYLENE, THE REMAINDER BEING ANOTHER ALKYLENE RADICAL HAVING FROM 2 TO 6 CARBON ATOMS AND N IS AN INTEGER FROM ABOUT 3 TO ABOUT 3000. THESE POLYETHER DIISOCYANATES MAY BE USED IN CHAIN EXTENSION AND CURING REACTIONS WITH COREACTANTS CONTAINING ACTIVE HYDROGEN, AND ELASTOMERS HAVING HIGH TENSILE STRENGHT AND ELONGATION CAN BE PRODUCED.
Inventors
- 👤 Samuel Smith
- 👤 Allen J Hubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:48
CPC Classifications
C; C07; C07C; C07C265/00; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/771
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |