Improvements to crushers with ring-shaped track and roller
CA 2285654 C · Owner: Obry, Christophe · Inventors: Chevalier, Philippe; Obry, Christophe; Lagache, Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a crusher comprising a ring-shaped track with horizontal axis (14) a roller (16) rolling on said track, means for pressing the roller on the track and means (18) for displacing the material from one track edge to the other so that it passes several times under the roller before it is evacuated. In order to improve the efficacy of the roller and the distribution of mechanical stresses in the roller and the track the track (14) and the roller (16) are so designed that the space between them decreases from the track (14) edge on the side supplying the material to be crushed up to a distance from said edge not less than 80 % the track width and that this space then …
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 April 15, 1997 and granted July 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2019.
- 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.