Process for producing hydrogen peroxide
CA 2111027 C · Owner: Ishiuchi, Yukio · Inventors: Kato, Tomio; Minato, Kazuyuki; Ogasawara, Kazuharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing hydrogen peroxide by subjecting a working solution containing anthraquinones as the reaction medium to reduction and oxidation alter- nately which process is characterized in that (1) the anthraquinones as tree reaction medium contained in the working solution area a mixture of an alkyl-substituted anthraquinone and an alkyl-substituted tetrahydroanthra- quinone (2) in the reduction step, the total amount of the alkyl-substituted tetrahydroanthraquinone in the working solution and part or the total amount of the alkyl-substituted anthraquinone in the working solution are reduced and (3) in the working solution after the reduction step the content of the …
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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 December 9, 1993 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.