Washing apparatus comprising a float body
CA 2284693 A1 · Owner: Kvaerner Pulping Ab · Inventors: Karlsson, Bjorn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a washing apparatus for washing cellulose pulp comprising a vertical, column-shaped washing vessel (2) and a screen unit (7) which is movable in the washing vessel, during a screening phase at a first speed, from an upper , position to a lower position and, during a return movement, at a , substantially higher speed from the lower position to the upper position there is a float body (30) which exerts a buoyancy force on the screen unit.
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 March 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2020.
- 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.