Patents by Inventor Frederick S. Howard

Frederick S. Howard 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 generating monopulse ultrasonic signals
    Patent number: 4507762
    Abstract: A method of transmitting half-sinewave ultrasonic monopulses utilizes a flip-flop (22) to reverse the states of a bridge circuit (Q.sub.1 -Q.sub.4) with each output pulse from a timing pulse generator (20). This reverses the polarity of a dc voltage which stresses a piezoelectric transducer (24) to substantially its limit. Each pulse from the timing generator thus causes one mechanical transition of the transducer and clamps it in its reversed stress condition, thereby producing a half-sinewave ultrasonic output for each timing pulse.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: March 26, 1985
    Assignee: The United States of America as represented by the Administrator Environmental Protection Agency
    Inventors: Raymond A. Meyer, Frederick S. Howard, John E. Brugger