Process for preparing glyoxylic acid
CA 1297902 C · Owner: Ono, Yasuko · Inventors: Arashiba, Nobumasa; Asano, Shiro; Ono, Yasuko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved process for obtaining glyoxylic acid in the form of monohydrate by (1) ozonolysis of maleic acid in lower alkanol such as methanol (2) catalytic hydrogenation of, the ozonolysis product in the presence of antioxidant such as hydroquinone, phenothiazine and 2,6-di-tert-butyl-p-cresol; and (3) followed by hydrolyzing the hydrogenated product.
Read the whole patent
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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- 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.