All season type pneumatic tires
CA 2070570 C · Owner: Yamanaka, Eiji · Inventors: Yamanaka, Eiji; Morimoto, Yoshiyuki; Yamauchi, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pneumatic tire comprising a rubber composition used for a tread. The rubber composition includes a rubber component and particulates of a crystalline syndiotactic-1,2-polybutadiene resin. The particulates have an average particle diameter of 1 to 500 µm and a melting point of said crystalline syndiotactic-1,2polybutadiene resin is not less than 110°C. A compounding ratio of the resin being 5 to 60 parts by weight relative to 100 parts by weight of the rubber composition. A matrix portion of the tread rubber other than the above particulates is preferably a foamed rubber. The particulates may be resin-composite particulates composed of the crystalline syndiotactic-1,2polybutadiene resin …
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 June 5, 1992 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2014.
- 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.