Patents by Inventor Youichi Ose

Youichi Ose 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).

  • Patent number: 5481107
    Abstract: A mass spectrometer comprising an ionization region for ionizing a sample under atmospheric pressure, an ion sampling aperture for introducing ions generated by the ionization region into a vacuum, and a mass analysis region for mass analyzing the ions on the basis of a high-frequency electric field, wherein: an electrostatic lens for deflecting the direction of the movement of the ion from the center axis of the ion sampling aperture is disposed between the ionization region and the mass analysis region; the center axis of an aperture for introducing ions into the mass analysis region and the center axis of the ion sampling aperture are disposed so as to be shifted in parallel from each other; and the center axis of the ion sampling aperture and the center axis of a cylindrical inner electrode constituting the electrostatic lens are disposed so as to be shifted in parallel from each other to thereby prevent charged droplets or droplets without charge from flowing into the mass analysis region.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: January 2, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Yasuaki Takada, Minoru Sakairi, Atsumu Hirabayashi, Youichi Ose