Preceramic polymers incorporating boron
CA 2079264 C · Owner: Matsumoto, Roger L. K. · Inventors: Matsumoto, Roger L. K.; Schwark, Joanne M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A boron-substituted polysilazane in which the boron is derived from a borane and is bound to the polysilazane through boron-carbon bonds is disclosed. The polysilazane is prepared by reacting a silazane ammonolysis product containing at least one 2-6 carbon alkenyl or alkenyl group with a borane containing at least one B-H group per molecule. The boron-substituted polysilazane can be used to prepare silicon carbide-containing ceramic articles.
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 September 28, 1992 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2014.
- 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.