Method of and device for fractionating suspensions
CA 2003515 C · Owner: Fjallstrom, Roland · Inventors: Frykhult, Rune; Fjallstrom, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method of fractionating suspensions preferably containing, fibre pulp, the suspension to be fractionated is sprayed in the form of at least one jet against one side of a filter sheet during displacement of the filter sheet and said jet of suspension relative to each other, so that the suspension is separated into a fine fraction, which passes through the screen holes of the filter sheet and which contains fine particles and, a coarse fraction, which does not pass through said screen holes and which contains coarse particles and some fine particles. According to the invention cleansing liquid in the form of at least one jet is sprayed against the filter sheet the filter, sheet and said …
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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 November 21, 1989 and granted June 29, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2011.
- 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.