Filter cylinder
CA 2062958 C · Owner: A. Ahlstrom Corporation · Inventors: Kohonen, Raimo; Heino, Jukka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates more closely to a so-called drum filter the basic construction of which comprises a vessel to which, suspension being thickened is supplied and in which vessel a wire-surfaced cylinder rotates. The drum filter in accordance with the present invention is characterized in that its filtrate compartments (20) comprise a bottom part (28 30) and a side surface (32), which is provided with a lip or bending (34) extending towards the inside of the compartment (20) at the edge opposite relative to the bottom plane, which lip (34) prevents the filtrate from escaping from the compartment (20) back through the wire surface when the compartment (20) is inclined.
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 26, 1990 and granted December 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2012.
- 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.