Patents by Inventor Tetsushi Okuyama

Tetsushi Okuyama 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).

  • Method for separating components in liquid specimen and apparatus used in said method
    Patent number: 6156195
    Abstract: The object of the present invention is to provide a method for separating components in a liquid specimen and an apparatus used in said method, by which it is possible to avoid carryover even when the specimen injector is not washed using washing solution and also to avoid the increase of inner pressure in column of the separation device or ineffective separating operation even when many liquid specimens are separated by many times using the same separation device. In the present invention, the liquid specimen is introduced into the separation device from a direction opposite to eluting direction of the separation device which retains an adsorbent, and by separating and eluting the specimen from eluting outlet together with the eluant, trace quantity of insoluble substances and the specimen remained on the specimen introducing passage can be removed by elution procedure.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: December 5, 2000
    Assignees: Shimadzu Corporation, Wako Pure Chemical Industries, Ltd.
    Inventors: Kenji Nakamura, Shinji Satomura, Masayoshi Hayashi, Hideyoshi Arashima, Tetsushi Okuyama, Nobuhiro Hanafusa, Koji Tanimizu
  • Method for separating components in liquid specimen and apparatus used in said method
    Patent number: 6149818
    Abstract: The object of the present invention is to provide a method for separating components in a liquid specimen and an apparatus used in said method, by which it is possible to avoid carryover even when the specimen injector is not washed using washing solution and also to avoid the increase of inner pressure in column of the separation device or ineffective separating operation even when many liquid specimens are separated by many times using the same separation device. In the present invention, the liquid specimen is introduced into the separation device from a direction opposite to eluting direction of the separation device which retains an adsorbent, and by separating and eluting the specimen from eluting outlet together with the eluant, trace quantity of insoluble substances and the specimen remained on the specimen introducing passage can be removed by elution procedure.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: November 21, 2000
    Assignees: Shimadzu Corporation, Wako Pure Chemical Industries, Ltd.
    Inventors: Kenji Nakamura, Shinji Satomura, Masayoshi Hayashi, Hideyoshi Arashima, Tetsushi Okuyama, Nobuhiro Hanafusa, Koji Tanimizu