Patents by Inventor Yasuki Ono

Yasuki Ono 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).

  • Process for producing dipentaerythritol
    Patent number: 5254749
    Abstract: The present invention relates to a process for producing dipentaerythritol through the dehydration condensation of pentaerythritol in the presence of an acid catalyst. This production process comprises the step of carrying out the dehydration condensation preferably in the presence of an acid catalyst, and/or the step of lowering the temperature of the reaction mixture before the conversion of pentaerythritol becomes not less than 25%, to stop the reaction so that the concentration of tripentaerythritol formed during the reaction may not be increased, and at the same time to give a reaction mixture containing dipentaerythritol in an increased concentration.
    Type: Grant
    Filed: August 9, 1991
    Date of Patent: October 19, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshihiko Kambara, Toru Idemoto, Yasuki Ono, Chika Tona