Patents by Inventor Seiichi Tokumaru

Seiichi Tokumaru 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 benzyl acetate and benzyl alcohol
    Patent number: 5883290
    Abstract: The present invention relates to a process for producing benzyl acetate and benzyl alcohol.Benzyl acetate itself is useful as a solvent and a perfume. Benzyl alcohol which is derived from the benzyl acetate by hydrolysis or by transesterification with methanol is an important compound useful as a powerful solvent, a nontoxic medical additive, and an intermediate compound for agricultural chemicals and medicines.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: March 16, 1999
    Assignee: Tosoh Corporation
    Inventors: Takashi Okada, Makoto Hanaya, Akitaka Hattori, Hideyuki Hamaji, Takanori Miyake, Seiichi Tokumaru, Nobuo Nagira, Shunya Ikumi, Takashi Hori, Norimasa Mizui
  • Maleic anhydride copolymer
    Patent number: 5336727
    Abstract: A maleic anhydride copolymer comprising maleic anhydride units (I), conjugated diene units (II) and aliphatic monoolefin units (III) is provided. This copolymer has a weight-average molecular weight of from 500 to 50000. The molar ratio of unit (I)/(unit (II)+unit (III)) ranges from 30/70 to 90/10 and the molar ratio of unit (II)/unit (III) ranges from 5/95 to 90/10. A hydrolyzed product of the copolymer or a water-soluble maleic acid copolymer is also provided. The hydrolyzed product is advantageously used for scale inhibitors, dispersants for calcium carbonate or admixtures for cement and conctrete.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: August 9, 1994
    Assignee: Tosoh Corporation
    Inventors: Tomoyuki Okazawa, Seiichi Tokumaru, Hideo Ohira, Masao Ishii, Yoshiaki Kano