Method and apparatus for classifying materials
CA 2199021 C · Owner: Emerging Acquisitions, Llc · Inventors: Miller, Roy R.; Clark, Brian K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disc screen (10) for classifying material by size. The disc screen comprises a frame (12), a plurality of shafts (16) mounted on the frame (12) parallel with one another, a first stage including discs (118) mounted on the shafts in a substantially coplanar row, each of the discs (118) having a perimeter shaped to maintain the space between discs substantially constant during rotation; and a second stage including discs (118a) mounted on the shafts in a substantially coplanar row, each of the discs (118a) having a perimeter shaped to maintain the space between discs substantially constant during rotation. A receiving section (130) agitates debris while the debris moves at an angle …
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 June 21, 1995 and granted August 10, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2017.
- 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.