Iodonium salts and process for the preparation thereof
CA 2125774 C · Owner: Scheiding, Silke · Inventors: Herzig, Christian; Scheiding, Silke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns iodinium salts of the general formula A-J+-B Xin which A is a group of the general formula (1) in which C is a monovalent aromatic hydrocarbon group with 6 to 14 carbon atoms or a monovalent aromatic hydrocarbon group containing at least one oxygen and/or sulphur atom and with 5 to 14 atoms in the aromatic ring D, E and F are, each substituents of C D being a group of the formula -(0)x-(R)y-SiR1/3 E being a group of the formula -OR2, F being a group of the formula -R3, a being 1, 2 or 3, b being 0, 1 or 2, c being 0, 1 or 2 x being 0 or 1 and y being 0 or 1, and R R1, R2 and R3 are as defined in claim 1; B is a group of the formula (2) in which E and F which are as …
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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 December 17, 1992 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 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.