Patents by Inventor Tohru Tsuru

Tohru Tsuru 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).

  • Corrosion rate measuring method and apparatus
    Patent number: 4238298
    Abstract: Sample plates of the material to be evaluated for corrosion resistance are arranged on electrodes immersed in a medium substantially corresponding to the actual environment of such material during use, small alternating current voltages of differing frequency are applied between the plates so as to determine from the difference between the peak voltages of the differing frequencies as converted from the currents flowing between both plates, the alternating current impedance of the corrosion reaction, which gives an indication of the corrosion rate of the material in the medium being tested.
    Type: Grant
    Filed: May 16, 1979
    Date of Patent: December 9, 1980
    Assignee: Shiro Haruyama
    Inventors: Tohru Tsuru, Shiro Haruyama