An apparatus for filtering suspensions and a method of operating the apparatus
CA 2069876 C · Owner: Beloit Technologies, Inc. · Inventors: Frykhult, Rune
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disc filter for filtering mat forming suspensions such as fibre pulp , suspensions, is provided with a hollow shaft for receiving a flow of fine fraction created by hydrostatic pressure difference between the suspension to be filtered and the fine fraction in the hollow shaft. According to the invention each disc (7) is , provided with a number of fine fraction chambers (11) communicating with the interior of the hollow shaft via respective holes (12) in the circumferential wall (5) of the shaft. Each chamber (11) is arranged, such that it functions as a dropleg during movement upwards with the result that the coarse particle (fibre) concentration of the created coarse fraction is …
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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 February 18, 1991 and granted May 23, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 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.