Composite material and method for producing the same
CA 2090771 C · Owner: Yanagawa Seiko Co. Ltd. · Inventors: Yanagawa, Chuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Composite material consisting of inner member fixed on the inner surface of annular outer member which is, characterized in that inner surface of said outer member and outer surface of said inner member are opposed to each other with a gap between them, while a plurality of projections are provided on at least one of said inner surface and said outer surface so as to project to the other surface, and that said outer and inner members axe joined together by means of a joining means placed in said gap between said inner surface and said outer surface and, the method for obtaining the same.
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 February 25, 1993 and granted December 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2015.
- 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.