Process and device for reducing the nitrate content of water
CA 2209216 C · Owner: Egner, Siegfried · Inventors: Janicke, Rene; Janicke, Joffrey; Herter, Nadine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To decrease the nitrate content of water it is, proposed to reduce nitrate to nitrogen in two stages. The first of these stages is a photochemical reduction to nitrite, and the second stage is a reduction of nitrite to nitrogen using amidosulphuric acid.
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 December 27, 1995 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2017.
- 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.