Method of liquid treating cellulose fibres and a device for carrying out the method
CA 1055754 A · Owner: Gillberg, Torsten · Inventors: Gillberg, Torsten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus of treating cellulose fibres in a cellulose pulp with a concentration of 10-90% with a liquid is disclosed. The pulp is intermittently given elastic compression forces and the cellulose fibres are subjected to pressure shocks with a duration not exceeding 1 second and of such a magnitude that the pressure in the interior of the fibres is increased to a valve exceeding 0.2 atmospheres excess pressure. The fibres are allowed to expand between the pressure shocks without remaining deformation and the treatment is maintained until complete impregnation and/or exchange of liquid enclosed in the fibres has been accomplished.
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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 June 5, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 5, 1996.
- 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.