Patents by Inventor Itsuji Maeda

Itsuji Maeda 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).

  • Method and apparatus for detecting defects in a surface regardless of surface finish
    Patent number: 3984189
    Abstract: A method and apparatus for detecting a flaw, color shading, or the like on the surface of a running object and for producing an electrical signal in response thereto by optically scanning such surface, characterized in that there is provided not only a photoelectric element for receiving the component of light regularly reflected from the surface of the running object, but also means for receiving the component of light irregularly reflected from the surface thereof, thereby to detect all of the defects that may exist on the surface of such object regardless of the surface finish.
    Type: Grant
    Filed: December 2, 1974
    Date of Patent: October 5, 1976
    Assignees: Hitachi Electronics, Ltd., Nisshin Steel Co.
    Inventors: Takeo Seki, Itsuji Maeda