Method for controlling pressurized screening device and pressurized screening device
CA 2018176 C · Owner: Ahonen, Juhani · Inventors: Rajala, Veli-Matti; Hautala, Jouko; Ahonen, Juhani
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for, controlling pressurized screening devices. Fibre pulp is fed to the, pressurized screening device and classified by means of a perforated, screenplate (7) into the accepted portion of the pulp passing through, perforations of said screenplate (7) and the rejected portion which is, removed from the screenplate. The perforated screenplate (7) is treated, by means of a device (11) moving relative to it. The screenplate (7), is cylindrical and the device (11) for treating it and moving relative, to it is designed to rotate round the centre line of the cross-section of, the cylindrical form of the screenplate (7). Fibre pulp is fed essentially parallel with …
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 4, 1990 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 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.