Patents by Inventor Donald E. Grissom

Donald E. Grissom 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).

  • Ultrasonic broadband frequency transducer pest repulsion system
    Patent number: 6166996
    Abstract: An ultrasonic broadband frequency transducer pest repulsion system comprises: a variable frequency generator; at least one ultrasonic frequency amplifier coupled to the variable frequency generator; and a transducer unit coupled to the ultrasonic frequency amplifier. The transducer unit comprises: a first transducer tuned at a first frequency located between a lower frequency and an upper frequency; a second transducer tuned at a second frequency located between the first frequency and the upper frequency, and a third transducer tuned at a third frequency located between the second frequency and the upper frequency.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: December 26, 2000
    Assignee: The No Mas Group, Inc.
    Inventors: Donald E. Grissom, Earl E. Chipley