Tyre tread
CA 2190880 C · Owner: Lagnier, Alain · Inventors: Lagnier, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tyre tread (10) including at least some raised portions having at least one groove (1) with facing walls (P) each having a relief surface made up of projections (2) and cavities (3) on either side of a median wall surface (M) each of said projections (2) and cavities (3) having on said median surface (M), a quadrilateral base (b¿S? b¿C?) and an apex (S, O', A', B', C') at a distance from said surface and the base (b¿S?) of one projection (2) being completely surrounded by the bases (b¿C?) of cavities (3).
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 23, 1995 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2017.
- 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.