Thickener
CA 2320997 A1 · Owner: Stotz, Wolf Gunter · Inventors: Stotz, Wolf Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to methods and corresponding devices for mechanically draining on a continuous basis suspensions (12) and sludge containing water especially suspensions of waste paper or sewage sludge between an endless , strainer band (1) and an endless and smooth compression surface (7) which moves in the scrolling direction of the suspensions. The suspension cake (13) to be drained is compressed between the strainer band (1) and the compression surface (7). To achieve the required compression pressure the strainer band , encompasses the cylindrical compression surface while applying a longitudinal stress during draining, the expelled water (14) being withdrawn from the …
Read the whole patent
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 February 10, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2021.
- 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.