Apparatus for filtering liquids
CA 2069866 C · Owner: Nordic Water Products Ab · Inventors: Frykhult, Rune
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for filtering liquids, such as fibre pulp suspensions or polluted water, includes annular hollow filter discs (5) each of which has two annular liquid pervious opposed walls (5, 7) covered , with filter material spray nozzle means (15-17) for, cleaning the filter material and means (12) for providing relative movement between the filter material and the spray nozzle means. The annular opposed walls of each filter disc are only attached to each other at their radially outer ends, whereas they are spaced from each other at their radially inner ends such that an annular , opening is defined between the interior of the filter disc and a filtrate chamber (11) extending centrally …
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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 December 19, 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.