1-aza-2-silacyclobutane compounds and method for their preparation
CA 2099790 C · Owner: Dow Corning Japan, Ltd. · Inventors: Tachikawa, Mamoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention unexpectedly introduces 1-aza-2-silacyclobutane compounds whose nitrogen is substituted by a hydrocarbon group or heteroatom-containing hydrocarbon group, whose N-Si bond remains highly reactive, and which are very effective as silanol endblocking agents and silane coupling agents. The present invention also introduces a method for the preparation of these l-aza-2-silacyclobutanes by the intramolecular hydrosilylation reaction of N,N-disubstituted aminosilane.
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
- Filed July 5, 1993 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2015.
- 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.