Patents by Inventor Masanao Shoji

Masanao Shoji 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).

  • Gas chromatograph with carrier gas control system
    Patent number: 5952556
    Abstract: A gas chromatograph includes a carrier gas supply flow path to which a pressure sensor, resistance tube, and control valve are sequentially connected. A differential pressure sensor is situated on both sides of the resistance tube to measure the differential pressure. The control valve is controlled by a controlling portion through signals from the pressure sensor and differential pressure sensor to control a flow rate of a carrier gas. Thus, in the gas chromatograph, the flow rate of the carrier gas can be controlled without an expensive pressure regulator, and a pressure of the carrier gas to be supplied can be selected as desired.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: September 14, 1999
    Assignee: Shimadzu Corporation
    Inventor: Masanao Shoji