Retaining filter, plant and method for treating effluents
CA 2247519 A1 · Owner: Maunoir, Siegfried · Inventors: Philip, Herve; Maunoir, Siegfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter for removing bacterial contaminants from effluents wherein filtering means comprise two mutually facing and spaced apart networks of pipes connected to the filter inlet and the filter outlet for distribution and drainage (14) respectively and provided with perforations distributed lengthwise along the transverse walls of said pipes. Filter means (16) between the two pipe networks (13 14) consist of a layer of sand with a size distribution curve within the range defined by A.F.N.O.R. DTU no. 64-1 Ref. P16-603, and remove a substantial part of the bacterial contaminants from the effluent passing through the filter. Distribution means connected to the distribution pipe network (13) …
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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 February 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2019.
- 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.