Organic polymer ferromagnetic material and process for preparing polymer
CA 2022546 C · Owner: Otsuka Kagaku Kabushiki Kaisha · Inventors: Ohta, Tadatoshi; Sato, Tsuneyuki; Tanaka, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An organic polymer ferromagnetic material characterized in that the material comprises a polymer obtained by subjecting to plasma polymerization or oxidation polymerization a methane derivative having two substituents and represented by the formula, (see fig.1) (1) wherein A is an electron accepting group and B is an, electron donating group, or by copolymerizing the methane derivative with a diarylmethane derivative represented by the formula, (see fig.2) (2), wherein R1 is a substituted or unsubstituted phenyl group by plasma polymerization or oxidation polymerization.
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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 August 2, 1990 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 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.