Sifting drum
CA 2061290 C · Owner: Lange, Werner · Inventors: Lange, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sifting drum which features sifting bars mounted along a cylindrical surface in parallel to the central cylinder axis, with the spaces between sifting bars forming the sifting gaps. The sifting bars are held by supporting rings in an axially equidistant configuration circumferentially to the cylinder circumference in peripherally open recesses in the supporting rings. The invention is characterized by the sifting bars relative to the sight line having lateral surfaces in a direction radial (V) to the sifting drum. At least one of these lateral surfaces in inclined by an angle away from the radius (V), resulting in a conicity between the two lateral surfaces of between 14 and 35° which …
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 17, 1992 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 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.