Patents by Inventor Keijun Hiraoka

Keijun Hiraoka 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).

  • Material for adsorbing pyrogen
    Patent number: 5498409
    Abstract: An insoluble material for adsorbing a pyrogen comprising a polymer of an aziridine compound. According to the present invention, a large amount of the pyrogen can be easily removed from a solution containing pyrogen, and a large amount of the material for adsorbing the pyrogen can be prepared in easy steps. Therefore, the adsorbing material can greatly contribute to the preparation of medicines.
    Type: Grant
    Filed: February 10, 1993
    Date of Patent: March 12, 1996
    Assignees: Chuichi Hirayama, Kohjin Co., Ltd.
    Inventors: Chuichi Hirayama, Keijun Hiraoka, Sunao Morimoto
  • Method of adsorbing pyrogens
    Patent number: 5401499
    Abstract: An insoluble material for adsorbing a pyrogen comprising a polymer of an aziridine compound. According to the present invention, a large mount of the pyrogen can be easily removed from a solution containing pyrogen, and a large amount of the material for adsporbing the pyrogen can be prepared in easy steps. Therefore, the adsorbing material can greatly contribute to the preparation of medicines.
    Type: Grant
    Filed: February 10, 1993
    Date of Patent: March 28, 1995
    Assignee: Shinkohjinkasei Co., Ltd.
    Inventors: Chuichi Hirayama, Keijun Hiraoka, Sunao Morimoto
  • High functional regenerated cellulose composition
    Patent number: 4981515
    Abstract: A regenerated cellulose composition having excellent adsorptivity and flame resistance prepared by a process in which viscose, a solvent-adsorbing active carbon in the form of an aqueous dispersion and a specific phosphorus flame retarder are extruded into a coagulation bath to regenerate cellulose which is dried at a temperature not lower than the boiling point of the solvent, whereby the adsorptivity of active carbon is maintained at a high level while a flame resistance is imparted to cellulose.
    Type: Grant
    Filed: September 12, 1989
    Date of Patent: January 1, 1991
    Assignee: Shinkohjinkasei Co., Ltd.
    Inventors: Keijun Hiraoka, Sunao Morimoto, Itaru Kimura