Patents by Inventor Yoshinao Nozawa

Yoshinao Nozawa 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 leakage detector
    Patent number: 4369647
    Abstract: A gas leakage detector comprising a solid state gas sensor having a sintered metallic oxide block which changes thermal conductivity by chemical adsorption thereto and a wire for transforming thermal conductivity charges into an electric signal. A suction pump draws gas through a gas intake path to the gas sensor. A voltage-frequency converter generates a pulse frequency that is a function of the gas sensor voltage. An alarm indicator including sound and/or light is controlled to pulse by the output pulse of the voltage frequency converter.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: January 25, 1983
    Assignee: New Cosmos Electric Company Limited
    Inventors: Tesshi Shigemori, Yoshinao Nozawa, Teruhisa Kojima, Satoshi Kitajima