Isocyanate compounds and their production
CA 1267157 C · Owner: Tsuboniwa, Noriyuki · Inventors: Urano, Satoshi; Mizuguchi, Ryuzo; Aoki, Kei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for preparing alkenoyl isocyanates of the formula:, wherein R is a hydrogen atom or a lower alkyl group. The process comprises subjecting an oxazolinedione hydrohalide of the formula:, wherein X is a halogen atom and R is as defined above to, decomposition under ordinary pressure in the presence of a hydrogen halide-eliminating agent and/or in a liquid medium having a dielectric constant of not more than 4. The process allows the alkenoyl isocyanates to be produced economically on an industrial scale.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.