Improved apparatus and method for deinking waste paper pulp
CA 2117071 A1 · Owner: Krofta, Milos · Inventors: Krofta, Milos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus (12) and method for deinking waste paper pulp using a foam flotation process to recycle printed waste paper for the manufacture of new paper. Pulped printed paper is fed as a slurry to an inlet (26) of a shallow tank (14). Internal guide walls (16) in the tank (14) establish a flow path (26) from the inlet to an outlet (28). The walls (16) are sized and positioned to create a generally uniform cross-sectional flow area. A plurality of modules (20) are disposed along the flow path (18). Each module (20) includes at least one injector (22) that aerates the flow and an extractor (24) that removes floated ink foam. A portion of the flow from each module (22) is recycled to an …
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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 4, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 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.