Radial tire
CA 2010462 C · Owner: Kawamura, Kazuhiko · Inventors: Kawamura, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radial tire which is provided herein has a tread comprising a central portion and two lateral shoulder portions made of a rubber composition which is different from that of the central portion. The axial distance of each of the boundaries between the radially-outer surface of the central portion and the radially-outer surfaces of the shoulder portions from the tire equator are not less than 0.15 times and not more than 0.3 times the tread width. The tread includes a shoulder portion and two shoulder portions. The tread is provided with two circumferentially-extending grooves the, boundary between the central portion and each shoulder portion being located within the width of each of the …
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 20, 1990 and granted March 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.