Method and apparatus for separating gas from a gaseous material
CA 2113450 C · Owner: Niskanen, Toivo · Inventors: Peltonen, Kari; Niskanen, Toivo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method and an apparatus for treating pulp. The method and apparatus in accordance with the present invention is especially applicable in realizing the bleaching processes of fiber suspensions and for separating residual gases remaining in the suspension. It is characteristic of the method in accordance with the present invention that pulp is treated at the consistency range of 8 to 20 % in a closed pressurized process in at least following treatment stages: pulp is supplied by a pump to a chemical mixer, chemicals are mixed in said pulp said pulp flow is passed by, means of the pressure of the pump to a process vessel said pulp is, treated with …
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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 15, 1992 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2014.
- 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.