Patents by Inventor Yoshihiro Nodate

Yoshihiro Nodate 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).

  • Purification process of methacrylamide
    Patent number: 5302754
    Abstract: A purification process of crude methacrylamide by recrystallization from an aqueous methacrylamide solution, comprising the steps of conducting crystallization by adjusting the hydrogen ion concentration of the aqueous methacrylamide solution to pH 8 or more, separating a methacrylamide crystal, adjusting 5% by weight or more of resulting mother liquor to pH 5 or less, separating precipitated insoluble matter, and reusing thus-treated mother liquor, is provided.The high quality methacrylamide crystal thus obtained is excellent in Hazen number, purity and transparency of a methanol solution and suitable for uses such as windshield glasses.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: April 12, 1994
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Akira Ibi, Toshimi Ogata, Yoshihiro Nodate, Takayuki Kageyama