Patents by Inventor Etienne M. M. de Crespin de Billy

Etienne M. M. de Crespin de Billy 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 characterizing surface flaws utilizing ultrasonic surface waves
    Patent number: 4307614
    Abstract: Disclosed is a method for determining the length of a surface flaw in an object, including the steps of generating a directional beam of ultrasonic waves on the surface of the object toward the flaw and at an angle .theta. with respect to the normal to the direction of the flaw, measuring the intensity of the waves reflected from the flaw, at an angle .theta.' with respect to the normal, as a function of frequency, and calculating the length 1 of the flaw according to the formula 1=n V.sub.R /[f.sub.n (Sin.theta.+Sin.theta.')] where n is a integral number defining the order of the frequency minimu, V.sub.R is the speed of the surface waves in the object, and f.sub.n is the frequency at which a minimum of intensity occurs.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: December 29, 1981
    Assignee: Rockwell International Corporation
    Inventors: Bernhard R. M. Tittmann, Gerard J. Quentin, Frederic S. Cohen Tenoudji, Alain R. Jungman, Etienne M. M. de Crespin de Billy