Process and apparatus for purification of wastewater
CA 2102134 C · Owner: Von Nordenskjold, Reinhart · Inventors: Kroner, Peter; Von Nordenskjold, Reinhart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification discloses a process and apparatus for the purification of wastewater in several successive stages wherein the wastewater is aerated in a first region and is then subjected to intermediate clarification in a second region and including a post-clarification aeration in a third region and post-clarification sedimentation in a fourth region. In order to provide a simple space-saving, low-cost, yet reliable wastewater treatment arrangement the apparatus, is arranged to include all four regions in one basin by providing separating walls in the basin. These regions can be preceded by other processing stage regions and followed by filtering or storage regions. In order to allow …
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 November 1, 1993 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 1, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2015.
- 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.