Patents by Inventor Kiyoharu Tsujimura

Kiyoharu Tsujimura 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 flow sensor and method of producing a gas flow sensor
    Patent number: 4624138
    Abstract: A mass gas flow sensor for measuring the mass flow rate of a gas through a passage, and a method of manufacture thereof. The sensor includes a substrate having a streamlined end surface which is to project upstream in the passage, upstream and downstream heating resistors formed on the substrate, protective films covering the resistors, and circuitry for applying current to the resistors so as to heat the resistors, the gas cooling the upstream resistor more than the downstream resistor. The circuitry also produces an electrical voltage responsive to differences in voltage across the upstream and downstream resistors, corresponding to the mass gas flow in the passage.
    Type: Grant
    Filed: June 12, 1984
    Date of Patent: November 25, 1986
    Assignee: Stec, Inc.
    Inventors: Hirofumi Ono, Kiyoharu Tsujimura, Masayuki Kamo, Yoritaka Isoda