Method for producing cellulosic forms
CA 2344162 A1 · Owner: Alceru Schwarza Gmbh · Inventors: Gunkel, Holger; Mooz, Michael
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 cellulosic forms such as , fibres, filaments, films, membranes or tubes by a) extruding a solution of cellulose in a hydrous amine oxide, especially N-methylmorpholine-N-oxide through a moulding tool, over an air gap and coagulating the form in an , aqueous precipitating bath containing amine oxide and b) guiding the form through at least one washing stage in order to remove the residual amine oxide. The method is characterised in that the precipitating bath liquid and/or the washing liquid are treated with ultraviolet radiation in the precipitating stage and/or in the washing stage(s) respectively. This prevents the formation and spread …
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 14, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2021.
- 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.