Rust and corrosion preventive compounds
CA 2004277 C · Owner: Idemitsu Kosan Co. Ltd. · Inventors: Kanamori, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rust and corrosion preventive compound represented by the following general formula: (I), wherein, n is an integer having a value of from 1 to 300 each R1 is an alkylene group of from 2 to 4 carbon atoms an arylene group of from 6 to 30 carbon atoms or a cycloalkylene group of from 6 to 30 carbon atoms with, the proviso when n is an integer having a value of 2 or more, the R1 groups may be identical with or different from one another, and, R2 is hydrogen atom an alkyl group of from 1 to 30, carbon atoms an aryl group of from 6 to 30 carbon, atoms or a cycloalkyl group of from 6 to 30 carbon atoms.
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 November 30, 1989 and granted January 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2011.
- 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.