Automatically adjusting shale shaker or the like
CA 2102217 C · Owner: Burgess, Harry L. · Inventors: Burgess, Harry L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shale shaker (20) or the like comprises a hollow body (42) having an inlet and an outlet (49). A screen (46) is mounted generally horizontally in the hollow body between the inlet and the outlet. A motive assembly (56) is operatively connected to the screen for repetitively moving the screen. A least generally horizontal tube (60) is connected to the screen for movement there-with. A solid weight (62) freely movable longitudinally in the tube automatically adjusts the center of gravity of the attached screen.
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, 1992 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2014.
- 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.