Method of treating waste paper for obtaining a stock suspension for the production of new paper and apparatus for the performance of the aforesaid method
CA 1107916 A · Owner: Escher Wyss G.M.B.H. · Inventors: Schnell, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for treating waste paper by pulping or defibering the paper in a stock pulper or slusher while infeeding water, wherein there are removed in succession, externally of the stock pulper heavy weight, particles, floatable substances and plastic foils. Thereafter, paper constituents which have incompletely defiberized are removed and further defibered in a special apparatus. The already defibered fibers are directly infed for further processing. The removal of the contaminants can be accomplished at a suspension density in the order of 1% whereas the defibering or pulping of the waste paper in the stock pulper occurs at about 4%. The employed sorting apparatus is …
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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
- Granted September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
- 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.