Patents by Inventor Tuyoshi Irie

Tuyoshi Irie 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 N-substituted maleimides
    Patent number: 4904803
    Abstract: N-substituted maleimides are prepared by reacting maleic anhydride with an amine in the presence of Cu or a copper compound and purifying the maleimide produced in the absence of presence of said Cu or copper compound. N-substituted maleimides are widely useful or starting materials or intermediates for medicines, agricultural chemicals, dyes, macromolecular compounds, and the like.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: February 27, 1990
    Assignees: Nitto Chemical Industry Co., Ltd., Mitsubishi Rayon Co., Ltd.
    Inventors: Takeyuki Fujita, Tuyoshi Irie, Yasuyuki Takayanagi, Takeshi Narita, Yuya Yano
  • Method for producing .alpha.,.alpha.-dimethyl-.DELTA.-valerolactone
    Patent number: 4734511
    Abstract: A method for producing .alpha.,.alpha.-dimethyl-.delta.-valerolactone which comprises carrying out the addition reaction of hydrogen bromide and 2,2-dimethyl-4-pentenoic acid in the presence or absence of a catalyst to synthesize 2,2-dimethyl-5-bromovaleric acid which is then subjected to ring-closure reaction by alkali treatment.
    Type: Grant
    Filed: October 16, 1986
    Date of Patent: March 29, 1988
    Assignee: Nitto Chemical Industry Co., Ltd.
    Inventors: Takeshi Inagaki, Tuyoshi Irie, Katsumi Nakamura, Denzi Sato