Grain cleaner and destructor of foreign matter in harvesting crops
CA 2041597 C · Owner: Board Of Trustees Of The University Of Arkansas (The) · Inventors: Reyenga, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for removing foreign matter from a harvested crop and for destroying the foreign matter wherein grain produced by a threshing process is passed over a screen to allow relative fine foreign matter to fall through the screen, while the grain is conveyed to a receptacle, and the foreign matter preferably is directed to a pair of rollers operative to crush the foreign matter to present germination of any seeds therein. Foreign matter removed during the threshing process also preferably is directed to a pair of rollers for crushing.
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 May 1, 1991 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2013.
- 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.