Process for producing unsaturated aldehydes and unsaturated acids
CA 2039563 C · Owner: Nippon Shokubai Kagaku Kogyo Co. Ltd. · Inventors: Hironaka, Hideyuki; Uchida, Shinichi; Kawajiri, Tatsuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for producing an unsaturated aldehyde or an unsaturated acid by catalytically oxidizing propylene or at least one compound selected from isobutylene, tert.-butyl alcohol and methyl-tert.butyl ether in a gaseous phase with molecular oxygen or a molecular oxygen-containing gas using a fixed bed multipipe reactor, characterized in that (a) a plurality of composite oxides different in occupied volume, represented by formula MoaWbBicFedAeBfCgDhOx ... (I), wherein Mo denotes molybdenum; W denotes tungsten; Bi denotes bismuth; Fe denotes iron; A denotes at least one element selected from cobalt and nickel; B denotes at least one element selected from an alkali metal, an alkaline earth …
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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 April 2, 1991 and granted December 31, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2013.
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Timeline
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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.