Effluent treatment in process for cellulosic fibrous aggregate preparation
CA 2295268 A1 · Owner: Maassen, Wilhelmus Antonius Hendrikus · Inventors: Belle, Jeroen Frederik Arthur; Maassen, Wilhelmus Antonius Hendrikus; Groeneveld, Hendrik Adriaan Cornelis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a cellulosic fibrous aggregate, comprising a softening (hydrothermolysis) stage and a curing stage, whereby in the softening stage a section of cellulosic fibrous material is exposed to the action of a liquid aqueous softening agent at elevated temperature and at a pressure of at least the equilibrium vapour pressure of the softening agent at the operating temperature, in which at least part of an aqueous stream contaminated with organic material, obtained as effluent stream from the zone wherein the softening has been effected is subjected to an anaerobic purification treatment and at least part of the resulting purified aqueous stream is recycled to 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 January 12, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 12, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 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.