Methods of preparing or purifying onium hydroxides by means of electrodialysis
CA 2353498 A1 · Owner: Botzem, Jorg · Inventors: Frede, Markus; Botzem, Jorg; Kober, Reiner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to methods for producing or purifying onium hydroxides of elements N, S or P by means of electrodialysis in an electrodialysis device comprising one or several cell units. Each cell unit consists of a bipolar membrane and an anionically selective membrane and a bipolar membrane or a cationically selective membrane is arranged between the last anionically selective membrane and the anode.
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 6, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 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.