Shoulder blocks for pneumatic tires and pneumatic tires employing such shoulder blocks in treads
CA 2048116 A1 · Owner: Ichiki, Yasufumi · Inventors: Ikeda, Hiromichi; Ichiki, Yasufumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shoulder block includes a thin groove formed substantially at a center in the circumferentially central portion of a tread, plural transverse sipes circumferentially spaced from the thin groove and at, least one circumferential sipe extending substantially circumferentially without intersecting any of the thin groove and the transverse sipes in such a manner that a circumferential component of this at least one circumferential sipe is greater than its transverse component. The thin groove extends widthwise of the tread, and has a length substantially equal to the width of the block. The transverse sipe extends widthwise of the tread, and opens at the side wall of the block on the side of …
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 July 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 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.