A process and a device for the decomposition of free and complex cyanides, aox, mineral oil, complexing agents, cod, nitrite, chromate, and separation of metals in waste waters
CA 2135171 A1 · Owner: Werz, Wilfried · Inventors: Werz, Wilfried; Ecker, Erwin; Massholder, Karl F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A b s t r a c t, Process for the decontamination of decontaminants in waste waters, wherein the waste water stream to be treated pass sequentially through following process steps - waste water treatment with hydrogen peroxide (H2O2) irradiating at the same time with W light - treatment with a reducing agent such as sodium dithionite, - precipitation of existing metal contaminants optionally followed by a filtration and/or a treatment with a selective ion exchanger.
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 May 5, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 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.