US3870683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light stable polyurethanes based on dicyclohexyl and diisocyanates
Assignee: Gulf Canada Ltd
•
Filing: 1971-12-21
•
Granted: 1975-03-11
•
Expires: 1991-12-21
Abstract
Abstract Polyurethanes may be formed from certain dicyclohexyl diisocyanates. That formed from 4,4''-dicyclohexyl diisocyanate is light stable.
Inventors
- 👤 Robert J Freure
- 👤 Maurice Moyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:26
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A POLYURETHANE COMPRISING THE REACTION PRODUCT OF A DIISOCYANATE OF THE FORMULA:
Claim 2
Dependent Claim
12 words
A POLYURETHANE COMPRISING THE REACTION PRODUCT OF A DIISOCYANATE OF THE FORMULA:
References Cited (Backward Citations)
US2606927A
Cited
US2606924A
Cited
US3351650A
Cited
US3357954A
Cited
US3535287A
Cited
US3510456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |