Process for separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant
CA 2332050 A1 · Owner: Schowanek, Diederik Rudolf · Inventors: Feijtel, Tom Cornelis Jan; Schowanek, Diederik Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention concerns a process for separating a first source of a heavy metal ion or mixtures of heavy metal ions (Me1), from a solution , comprising a complex of said Me1 and ethylenediamine-disuccinic acid (EDDS) (Me1-EDDS), by displacement of said Me1 with a second source of a heavy metal ion Me2 by addition to the solution of a salt of said Me2.
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 June 11, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.