Process for preparing rubber sheet and tread and studless tire using same
CA 2433808 A1 · Owner: Kikuchi, Naohiko · Inventors: Tsumori, Isamu; Kikuchi, Naohiko; Minakoshi, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in dime rubber so as to be oriented in the tread thickness direction wherein, when measured at 25°C the tread has a complex elastic modulus E1 in the tread thickness direction, and the sheet has a complex elastic modulus E.alpha. in the extrusion direction and a complex elastic modulus E.beta. in a 90° direction from the extrusion direction when the rubber, composition is made into 2 mm sheets with a roller and these moduli fulfill 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 June 26, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2025.
- 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.