US3859299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dioxazolone isocyanates
Assignee: Bayer AG
•
Filing: 1972-11-15
•
Granted: 1975-01-07
•
Expires: 1992-11-15
Abstract
Abstract Compounds of the formula WHEREIN R is a divalent radical corresponding to c1 to C18 alkyl, C7 to C18 aralkyl or C6 to C14 aryl. These compounds are useful as isocyanate precursor compounds in the preparation of polyurethane plastics by the well-known polyaddition process simply by heating.
Inventors
- 👤 Jurgen Hocker
- 👤 Rudolf Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
C; C07; C07D; C07D273/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
5 words
AN ISOCYANATE OF THE FORMULA
Claim 2
Dependent Claim
5 words
AN ISOCYANATE OF THE FORMULA
Claim 3
Dependent Claim
16 words
The isocyanate of claim 1 wherein R is branched or unbranched C4 to C12 alkylene. 3.
References Cited (Backward Citations)
US3335131A
Cited
US3182068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |