Process and equipment for pretreatment of cellulosic raw-material
CA 1322827 C · Owner: Aho, Osmo · Inventors: Aho, Osmo; Aho, Antti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process and an equipment for pretreatment of cellulosic chip-formed raw-material by impregnation. In the process, first a vacuum treatment is carried out withou preceeding moistening treatment and as, soon as possible after the vacuum treatment penetration is, carried out with a solution of chemicals or with water at the atmospheric or a higher solution pressure. In this way the fiber cavities can be filled optimally which promotes a, uniform and adequate diffusion of the solution into the fiber walls significantly. The process can be carried out e.g. in a device which comprises a tank for the treatment of the raw-material and therein a feed opening for the solution …
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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
- Granted October 12, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 12, 2010.
- 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.