Preparation of trialkylsilyl nitrile
CA 2113768 C · Owner: John, Thomas V. · Inventors: Larson, Gerald L.; Subramaniam, Chitoor S.; Chawla, Ram R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Trialkylsilyl nitrile is prepared by anhydrously reacting stoichiometric amount of trialkylsilyl halide hexaalkyldisilazane or trialkylsilyl amine and hydrogen cyanide, in the absence or presence of a solvent or inert gas atmosphere. No catalyst is necessary and the reaction preferably is, performed at a temperature of from 5°C to 25°C.
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 January 19, 1994 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2016.
- 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.