Method of processing printed waste-paper
CA 2096659 C · Owner: Ortner, Herbert · Inventors: Dorflinger, Hans-Dieter; Ortner, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of processing printed waste paper, in particular waste paper containing at least 80% newsprint or magazine paper by digestion various, cleaning steps, flotation or washing and disintegrating the, latter with a high consistency of at least 20% and possibly, bleaching. The invention is characterized by the fact that a final second disintegrating step, arranged possibly before a bleaching step, with treatment of the waste paper under strong kneading action of individual bar-shaped or blockshaped kneading elements of both the stator and the rotor of the disintegrating machine which are arranged in a kneading chamber thereof which is delimited by two …
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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 September 18, 1992 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2014.
- 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.