Patents by Inventor Yoshitaka Ina

Yoshitaka Ina 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).

  • Mass flow control method and device utilizing a sonic nozzle
    Patent number: 6012474
    Abstract: A control circuit (20) of a mass flow control device (1) retains the relation (Cd=f(ReTH)) between the Reynolds number and the actual discharge coefficient of a sonic nozzle (13) in the area where the Reynolds number is small. In such an area, the sonic nozzle can be used as a variable mass flow element for controlling mass flow rate. If a pressure Pu and a temperature Tu of an upstream fluid of the sonic nozzle 13 are detected, the theoretical mass flow rate QmTH and the theoretical Reynolds number ReTH can be calculated; since the actual discharge coefficient Cd can be calculated by the above relationship Cd=f(ReTH) based on the calculated Reynolds number, the actual mass flow rate Qm can be calculated based on the relation of Qm=Cd.multidot.QmTH.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: January 11, 2000
    Assignee: Hirai Co., Ltd.
    Inventors: Masaki Takamoto, Shinichi Nakao, Masahiro Ishibashi, Yoshitaka Ina, Yoshikazu Yokoi, Masao Hayakawa