Patents by Inventor John R. Walden

John R. Walden 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).

  • Sonar receivers
    Patent number: 4433396
    Abstract: A sonar receiver comprises an inwardly curved reflector arranged to direct received sonar signals onto a transducer system. The transducer system comprises an array of transducers distributed over an inwardly curved path facing the reflector. Each transducer is responsive to sonar signals received from a particular direction to provide an output signal indicative of a reflecting object, the amplitude of which signal is related to distance of the reflecting object.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: February 21, 1984
    Assignee: Plessey Overseas Limited
    Inventors: Phillip L. M. Johnson, John R. Walden