Carbon electrode, and method and apparatus for the electrolysis of a hydrogen fluoride-containing molten salt by the use of the carbon electrode
CA 2035815 C · Owner: Tojo, Tetsuro · Inventors: Tojo, Tetsuro; Watanabe, Nobuatsu; Kondo, Teruhisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carbon electrode is disclosed comprising a porous carbon block and having a flexural strength of at least 50 MPa and exhibiting, on a linear sweep voltammogram obtained by subjecting the carbon electrode to potential sweep in concentrated sulfuric acid at 25 C, a peak having a maximum current density at a potential of at least 1.2 V. This carbon electrode is substantially free from the danger of destruction and the danger of local breakage and partial coming-off and can advantageously be used as an anode not only for stably conducting the electrolysis of an HF-containing molten salt but also for producing a desired electrolysis product with high purity.
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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 6, 1991 and granted January 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.