Patents by Inventor Toshiharu Yokohama

Toshiharu Yokohama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing an aldehyde
    Patent number: 5306845
    Abstract: A method for producing an aldehyde, which comprises hydrogenating a carboxylic acid or its alkyl ester with molecular hydrogen in the presence of a catalyst, wherein (1) chromium oxide of high purity having a specific surface area of at least 10 m.sup.2 /g and a total content of sodium, potassium, magnesium and calcium of not more than 0.4 wt %, is used as the catalyst, and (2) the hydrogenation reaction is conducted while maintaining the carboxylic acid or its alkyl ester at a concentration of not more than 10 vol %.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: April 26, 1994
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Toshiharu Yokohama, Naoko Fujita, Takao Maki