Water-soluble conducting polymer and method for production thereof
CA 2084360 C · Owner: Ikenoue, Yoshiaki · Inventors: Ichikawa, Reiko; Ikenoue, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-soluble conducting polymers having a chemical structure represented by, for example the, formula (I), wherein R1 and R2 independently represent H a C1 to C20, alkyl or alkoxy group, amino group trihalomethyl, group or phenyl group, X represents S O, Se, Te or, NR3, R3 represents H, a C1 to C6 alkyl group or an aryl group, M represents a cation such as H+ an alkali, metal ion or quaternary ammonium and m is 0.2 to 2, and a method for the production thereof by the reaction of a sulfonating agent on a derivative of for example, isothianaphthene or isobenzofuran.
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 December 2, 1992 and granted October 3, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 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.