Patents by Inventor Yukuo Nezu

Yukuo Nezu 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).

  • Exchange method of mobile phase in high-performance liquid chromatography mass spectrometry and its apparatus
    Patent number: 5117109
    Abstract: The components present in the sample with a mobile phase A in 1st section is separated. In 2nd section there is provided with an inserting line of a dilute solution for diluting the mobile phase A and a trapping column which forces the dilute solution to pass but catches the components by connecting said line to said column. In 3rd section, the components caught by the trapping column are introduced into mass spectrometer by using a mobile phase B. It is preferable to use respectively different mobile phases for the mobile phase A and the mobile phase B. It is good to install separating columns in 1st and 3rd sections. It is also desired to add the retaining apparatus of the components separated in 1st section.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: May 26, 1992
    Assignee: Eisai Co. Ltd.
    Inventors: Naoki Asakawa, Hiroshi Ohe, Yutaka Yoshida, Tadashi Sato, Yukuo Nezu, Yoshiya Oda