Pneumatic tire with improved traction and steerability on snow-covered surfaces
CA 2083447 C · Owner: Sumitomo Rubber Industries, Limited · Inventors: Shibata, Kouji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pneumatic tire with a block pattern has a tread edge including edges along circumference of each of the plurality of blocks and groove edges along a circumference of block grooves provided, as required, in the block and of which at, least one end of each of the block grooves is terminated in the block. The tread edge has a lateral edge density .alpha. defined as a ratio A/S of the sum A of a length of edge components in the lateral direction of the tread edge which face toward a leading edge of the tire tread element and are placed in a ground-contact zone of the tread part to an area S of the ground-contact zone, the lateral edge density being in a range of 0.085 to 0.15(1/mm). The ratio …
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 November 20, 1992 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.