Magnetooptical recording media
CA 2014751 C · Owner: Mitsui Chemicals, Incorporated · Inventors: Mizumoto, Kunihiko; Hashimoto, Hidehiko; Todo, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical recording media disclosed herein are excellent in adhesion between the substrate and the magnetooptical recording film, as well as in oxidation resistance and long term-stability of magnetooptical recording characteristics said substrate containing a, cycloolefin random copolymer composition and having a specific structure.
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 April 18, 1990 and granted January 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 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.