Radial tyre
CA 2036236 C · Owner: Kikuchi, Naohiko · Inventors: Watanuma, Susumu; Kikuchi, Naohiko; Saito, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an optimum radial tyre which is suitable for most cars. In the present invention, an a value is introduced as indicating the properties of the car and the tread rubber of the tyre is selected according to the .alpha. value. Accordingly the present, invention provides a radial tyre which comprises a tread and sidewall, wherein the tread has the claimed relation between a viscoelasticity (tan .delta.) peak temperature (Tg) and an a value which indicates the properties of a car and a, one side half width (w/2) near the tan .delta. peak temperature of 25 deg or less.
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 13, 1991 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2013.
- 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.