Patents by Inventor Peter W. Kushnick

Peter W. Kushnick 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).

  • Constant frequency pulsed phase-locked loop measuring device
    Patent number: 5214955
    Abstract: A measuring apparatus uses a fixed frequency oscillator to measure small changes in the phase velocity ultrasonic sound when a sample is exposed to environmental changes such as changes in pressure, temperature, etc. The invention automatically balances electrical phase shifts against the acoustical phase shifts in order to obtain an accurate measurement of electrical phase shifts.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: June 1, 1993
    Assignee: The United States of America as represented by the United States National Aeronautics and Space Administration
    Inventors: William T. Yost, Peter W. Kushnick, John H. Cantrell
  • Method of characterizing residual stress in ferromagnetic materials using a pulse histogram of acoustic emission signals
    Patent number: 5164669
    Abstract: The invention is a method and apparatus for characterizing residual uniaxial stress in a ferromagnetic test member by distinguishing between residual stresses resulting from positive (tension) forces and negative (compression) forces by using the distinct and known magnetoacoustic (MAC) and a novel magnetoacoustic emission (MAE) measurement circuit means. A switch permits the selective operation of the respective circuit means.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: November 17, 1992
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Min Namkung, Peter W. Kushnick, William T. Yost, John L. Grainger