Patents by Inventor Toy T. Shigekawa

Toy T. Shigekawa 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).

  • Test panel for evaluating inspection penetrants
    Patent number: 4078417
    Abstract: A test panel for use in evaluating fluorescent penetrants and being composed of a spring steel substrate having surfaces coated with a thin electroless nickel plating capable of producing stress induced microcracks in the plated surfaces.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: March 14, 1978
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Toy T. Shigekawa
  • Method and device for evaluating penetrants
    Patent number: 3958119
    Abstract: A method is provided for evaluating fluorescent penetrants in which a penetrant to be evaluated is applied to a bevelled edge of a laminate of adhesively bonded metal sheets, the edge having shallow, parallel grooves formed therein between the metal sheets. After removal of excess penetrant from the edge, a developer is applied thereto and the edge is exposed to ultraviolet light. By observing the appearance of the bevelled edge, e.g., the brightness of the parallel lines resulting from penetrant being drawn from the grooves through action of the developer, an indication of the efficacy of the penetrant is obtained.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: May 18, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Toy T. Shigekawa