Patents by Inventor Itsuo Nishiwaki

Itsuo Nishiwaki 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 production of methacrylic acid esters
    Patent number: 4329492
    Abstract: A continuous process for producing methacrylic acid ester from methacrylic acid and a lower alcohol containing 1 to 3 carbon atoms utilizing sulfuric acid as a catalyst and a hydrophobic solvent to assist in the formation of a heterogeneous reaction mixture, the process being particularly characterized by the steps of reconcentrating and reusing the sulfuric acid.
    Type: Grant
    Filed: November 21, 1980
    Date of Patent: May 11, 1982
    Inventors: Naoki Andoh, Itsuo Nishiwaki, Masatoshi Arakawa