Patents by Inventor Kouhei Nagahara

Kouhei Nagahara 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 preparing a purified treponemal antigen and use thereof
    Patent number: 5591596
    Abstract: A process for preparing a purified syphilis antigen which comprises adsorbing an extract originated from Treponemda pallidum on a hydroxyapatite gel, followed by elution, while an aqueous medium is used.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 7, 1997
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Fumio Ishikawa, Kouhei Nagahara, Mie Matsumoto
  • Process for preparing purified syphilis antigen from Treponema palljdum
    Patent number: 5474900
    Abstract: A process for preparing a purified syphilis antigen from Treponema pallidum is presented. The process comprises the steps of obtaining an extract from Treponema pallidum, adsorbing the extract onto hydroxyapatite gel and eluting the antigen in the presence of a surfactant. The preferred surfactant is octylglucopyranoside, A diagnostic agent is prepared which comprises the purified syphilis antigen adsorbed on an inert carrier, which carrier at least partially a hydrophobic carrier to which the antigen is adsorbed.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: December 12, 1995
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Fumio Ishikawa, Kouhei Nagahara, Mie Matsumoto