Silylating agent
CA 2017699 C · Owner: Akihiko, Shirahata · Inventors: Akihiko, Shirahata
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a silylating agent of formula (CH3)(R)(R1)SiX ;, where R is an isopropyl group R1 is a monovalent, hydrocarbon group having 2 to 6 carbon atoms and X is a, chlorine atom or bromine atom but exclusive of the, compounds methyldiisopropylchlorosilane and n-butylisopropylmethylchlorosilane. The silylating agent of the present invention provides a silylation product which is much more stable than the silylation product obtained with trimethylchlorosilane and its protective group is as stable as the silylation product obtained from t-butyldimethylchlorosilane. Moreover the present described silylating agents are characterized by an easier desilylation than the …
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 May 29, 1990 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2012.
- 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.