Method and device in the regulation of a headbox
CA 2127309 C · Owner: Nyberg, Petri · Inventors: Nyberg, Petri; Linsuri, Ari; Huovila, Jyrki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and device in the regulation of the headbox. The headbox includes a pulp inlet header, after the pulp inlet header seen in the pulp flow direction, a distributor manifold whose pipes are opened into an intermediate chamber. The headbox comprises an attenuation chamber placed in connection with the intermediate chamber and, after the intermediate chamber a turbulence generator, having tubes which are opened at their outlet end, into a, discharge duct and at their inlet end, into the intermediate chamber. In the method, into different positions along the width of the headbox, a pulp suspension flow is introduced the, concentration of this flow is adjustable by combining two component …
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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 July 4, 1994 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2016.
- 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.