High reduction ratio crushing in conical/gyratory crushers
CA 2220618 C · Owner: Nordberg Inc. · Inventors: Karra, Vijia Kumar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The residence time of material in the crushing cavity of a conical/gyratory crusher is controlled by providing the crusher with a flow restricting arrangement at the lower end of the crushing surfaces. The flow restricting arrangement includes a frustum ledges or ring of outwardly directed fingers provided at the lower end of the mantle which fingers are interspaced with inwardly directed fingers provided at the lower end of the bowl liner. The flow restricting arrangement also includes a solid ring or a frustum provided at the lower end of the mantle.
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 7, 1997 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 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.