Metal plate having a rust-preventive layer, its production process and a treatment liquid in which it is processed
CA 2240934 C · Owner: Sakon, Tadashi · Inventors: Jitsuhara, Ikuo; Sakon, Tadashi; Tadokoro, Kenichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A metal plate having a rust preventive organic layer said rust-preventive organic layer being a colloid or micelle of a slightly water soluble organic corrosion inhibitor as an organic layer mixed with and dispersed in a matrix resin, its production process and a treatment liquid in which it is processed.
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 17, 1996 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2018.
- 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.