Patents by Inventor Tsuyoshi Koni

Tsuyoshi Koni 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).

  • Flow restrictor
    Patent number: 4418723
    Abstract: Improvements in a flow restrictor for use in a flowmeter measuring a flow rate according to the pressure drop caused by laminar flow, utilizing the fact that the pressure drop is proportional to the flow rate. The flow restrictor comprises a cylindrical member, and a housing having a fluid inlet and a fluid outlet for accommodating the cylindrical member, wherein at least one groove or spiral groove for passing fluid is formed in the peripheral direction of the cylindrical surface of the cylindrical member or in the peripheral direction of the inner surface of the housing forming a cylindrical cavity for accommodating the cylindrical member.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: December 6, 1983
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Tsuyoshi Koni, Yoshihisa Urushida