Process for producing methacrylic acid and a catalyst
CA 1135245 A · Owner: Nippon Kayaku Kabushiki Kaisha · Inventors: Matsumoto, Mutsumi; Sugi, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst having heteropoly-acid structure and the general formula: wherein, X represents one or more elements selected from the group consisting of tin, lead, cerium, cobalt, iron, zirconium thorium, tungsten, germanium, nickel, rhenium bismuth, antimony, chromium, boron, magnesium. silver aluminum, zinc, and titanium and a, b, c d, o, f, and g represent the atomic ratio of the elements where, a is 10, b is a number of 3 or less than 3 excluding 0 c is a number of 0.5 to 6, d is a number of 3 or less than 3 excluding 0 e is a number of 3 or less than 3 excluding 0 f ? a number of 0 to 3, g is a number determined depending on the valency and atomic ratio of other elements. There is also …
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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
- Granted November 9, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 1999.
- 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.