Method and device for treatment of fibrous material
CA 2282598 C · Owner: Johansson, Ola · Inventors: Johansson, Ola; Svedberg, Peter; Danielsson, Ove
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for mechanical working of lignocellulosic fibrous material in a refiner with refining means (11, 12) rotating relative to each other and a , device (22) for feeding the fibrous material into the refiner. The material is accelerated outward without material build-up through a feed zone (18) without mechanical working, and the material density is at maximum 10 kg/m3. Thereafter, the mechanical working is carried out in an outside located refining zone (16). The feeding device (22) comprises a front axial screw (23), which transforms to a least one substantially radial rear wing (24). The feeding device (22) is intended to be placed centrally on the rotary refining means (12).
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 February 3, 1998 and granted October 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 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.