Electrochemical process for preparing glyoxylic acid
CA 2130552 A1 · Owner: Scharbert, Bernd · Inventors: Babusiaux, Pierre; Scharbert, Bernd; Dapperheld, Steffen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrochemical process for preparing glyoxylic acid The present invention describes a process for preparing glyoxylic acid by electrochemical reduction of oxalic acid in aqueous solution in divided or undivided electrolytic cells, wherein the cathode comprises carbon or at least 50% by weight of at least one of the metals Cu Ti, Zr, V, Nb, Ta, Fe, Co, Ni, Zn, Al, Sn and Cr and the aqueous electrolysis solution in the undivided cells or in the cathode compartment of the divided cells in addition contains at least one salt of metals having a hydrogen overpotential of at least 0.25 V based on a, current density of 2500 A/m2. The process according to the invention has the advantage that …
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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 February 2, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 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.