Process for the production of cellulosic fibres
CA 2413706 A1 · Owner: Lenzing Aktiengesellschaft · Inventors: Ruf, Hartmut; Schrempf, Christoph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for producing cellulose fibres. According to said method, a solution of cellulose in a tertiary amino oxide is extruded through the spinning holes of a spinneret and the extruded filaments are fed into a precipitation bath whilst being drawn via an air gap. The filaments are exposed to a gaseous stream in the air gap. The invention is characterised in that the temperature (T) of the gas prior to the contact with the filaments is represented by the formula: 60 ~C < T < 90 ~C.
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 June 28, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2023.
- 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.