Patents by Inventor Eric A. Ash

Eric A. Ash 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).

  • Acoustic image recorders
    Patent number: 4179936
    Abstract: A method of sensing changes in an object comprising irradiating the object with a focused beam of acoustic radiation excited by a first alternating electric signal; receiving a beam of acoustic radiation modulated in phase and amplitude by the object in the vicinity of the focus and deriving a second alternating electric signal therefrom; providing a reference electric signal derived from the first alternating electric signal and at a known phase; mixing coherently the second signal and the reference signal to derive a first in-phase signal; mixing the second signal with the reference signal altered in phase by between 80.degree. and 100.degree.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: December 25, 1979
    Assignee: National Research Development Corporation
    Inventors: Simon D. Bennett, Eric A. Ash