Process for manufacturing cellulose moulded bodies and a device for carrying it out
CA 2102809 C · Owner: Ecker, Friedrich · Inventors: Rauch, Ernst; Zikeli, Stefan; Koberger, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To prepare cellulose mouldings, a solution of cellulose in a tertiary amineoxide, is moulded in a hot state and the moulded solution is introduced into a precipitation bath in order to precipitate the contained cellulose wherein , the, hot moulded solution is cooled before introduction into the precipitation bath. Cooling occurs immediately after the moulding process and preferably consists of blowing air horizontally on to the cellulose moulding. The process according, to the invention allows spinning of the cellulose solution with a high fibre density without the spun fibres sticking together after emerging from the spinneret. In spite of the high fibre density it furthermore allows the …
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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
- Filed March 17, 1993 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2015.
- 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.