Tumble grinder with screen portion
CA 2088638 C · Owner: Astec Industries, Inc. · Inventors: Hogan, Patrick J.; Dorscht, John P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tumble grinder is disclosed in which material which is already sufficiently small in size primarily being, abrasive aggregate or earthen material may be discharged from, the receptacle to bypass the comminution apparatus and thus substantially reduce wear thereto. A portion of the cylindrical wall of the receptacle is provided with classifying openings, for example by providing a screened opening as a band around the receptacle. The classifying openings permit material which is already smaller than the size of the openings to fall therethrough thereby bypassing, the comminution apparatus. Preferably a conveyor is, positioned beneath the receptacle to catch and discharge the, material …
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 February 2, 1993 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2015.
- 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.