Process for producing cellulose fibres
CA 2206250 C · Owner: Lenzing Aktiengesellschaft · Inventors: Eibl, Markus; Eichinger, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a process for the production of cellulose fibres, said process comprising the following steps:, (A) dissolving a cellulose-containing material in an aqueous, tertiary amine-oxide to obtain a spinnable cellulose solution;, (B) spinning said cellulose solution and passing it through an aqueous precipitation bath, whereby watercontaining, swollen filaments are obtained; (C) squeezing said water-containing, swollen filaments at various points, so that at least two squeezing points per millimeter of filament length on average are achieved and, (D) drying said squeezed filaments to cellulose fibres wherein squeezing is carried out using a pressure big enough so …
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 October 8, 1996 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2018.
- 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.