Patents by Inventor Shigeyuki Shibata

Shigeyuki Shibata 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).

  • Quaternary ammonium salt and process for the preparation thereof
    Patent number: 6664224
    Abstract: The novel quaternary ammonium salt according to the invention has two quaternary ammonium groups connected to a benzene ring, wherein two C4-12 alkyl groups and one C1-2 alkyl group are connected per one nitrogen atom constituting the quaternary ammonium. The compound is used as an antimicrobial agent, exhibits a high safety to human as compared with known antimicrobial agents, exerts an excellent sterilizing effect itself and exhibits a wide sterilizing spectrum. In particular, the compound is used as a presevative for eye drop.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: December 16, 2003
    Assignee: Toagosei Co., Ltd.
    Inventors: Hiroki Kourai, Shigeyuki Shibata, Katsuyoshi Harada, Masayoshi Kume
  • Novel quaternary ammonium salt and process for the preparation thereof
    Publication number: 20020006888
    Abstract: The novel quaternary ammonium salt according to the invention has two quaternary ammonium groups connected to a benzene ring, wherein two C4-12 alkyl groups and one C1-2 alkyl group are connected per one nitrogen atom constituting the quaternary ammonium. The compound is used as an antimicrobial agent, exhibits a high safety to human as compared with known antimicrobial agents, exerts an excellent sterilizing effect itself and exhibits a wide sterilizing spectrum. In particular, the compound is used as a presevative for eye drop.
    Type: Application
    Filed: May 15, 2001
    Publication date: January 17, 2002
    Applicant: TOAGOSEI CO., LTD.
    Inventors: Hiroki Kourai, Shigeyuki Shibata, Katsuyoshi Harada, Masayoshi Kume