Method and device for the continuous, single-step production of a homogeneous solution of cellulose in hydrous tertiary aminoxides
CA 2427478 A1 · Owner: Thuringisches Institut Fur Textil-Und Kunststoff-Forchung E.V. · Inventors: Diener, Andreas; Michels, 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 and to a device for the continuous single-, step production of a homogeneous solution of cellulose in hydrous aminoxides on the basis of cellulose and aqueous aminoxides preferably N-, methylmorpholino-N-oxide (NMMO) at temperatures in the range of from 50 to 130 ~C under a vacuum and water evaporation. The cellulose and the NMMO are dosed separately to the device, mixed while sheared the water is evaporated , until the mixture is dissolved the solution is homogenized and directly fed to the consumer via screw conveyors, pumps and filters.
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 September 5, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 5, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2022.
- 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.