Soil separating apparatus and method
CA 2047211 C · Owner: Read, James L. · Inventors: Read, James L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved soil feeder system in combination with a soil separating apparatus and method of controlling the feeding of soil material employing the soil feeder. The soil feeder apparatus includes a hopper body having inclined walls and flat bottom surface to define a hopper space to receive soil material and characterized by an opening at one and for controlling the feeding of soil materials to be screened. The body includes a funnel-shaped wall to direct the soil material inwardly into the hopper body, and a hydraulic cylinder at the one end to tilt the hopper body between a soil receiving position and a tilted soil discharging position. The soil feeder apparatus includes a sensor for …
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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 January 25, 1991 and granted December 22, 1992. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 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.