Improvements to ring-roller crusher
CA 2286563 C · Owner: Lagache, Philippe · Inventors: Obry, Christophe; Cordonnier, Alain; Chevalier, 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 consisting of a ring (10) with horizontal axis means for driving the ring in rotation about its axis at least one roller (16) whereof the axis is parallel to that of the ring and which is placed inside the latter so as to roll on its internal surface and elastic means (30) pressing the roller on the ring the roller being supported at its ends by two arms (22) fixed on the crusher frame so as to pivot about an axis parallel to the ring axis. In order to limit the canting of the roller while limiting the crushing pressure and thereby the mechanical stresses to acceptable values the arms (22) are mutually linked by a torque shaft (24) parallel to the rotation …
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 April 8, 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.