Patents by Inventor James C. Ravis

James C. Ravis 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).

  • Regulated variable frequency DC/DC converter
    Patent number: 4257089
    Abstract: This circuit converts a DC voltage of one value to a regulated DC voltage of another value. The circuitry includes a variable frequency clock controlled by an error voltage derived from the converter output. A pulse of constant length is produced for each cycle of the clock. Logic circuitry is arranged to alternately feed these constant length pulses to opposite sides of a push-pull power amplifier, the output of which is rectified and filtered to form the converter output.
    Type: Grant
    Filed: September 13, 1979
    Date of Patent: March 17, 1981
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: James C. Ravis
  • Dual class amphibious target discriminator
    Patent number: 4081785
    Abstract: A dual class amphibious target discriminator distinguishes between waterborne carriers and bottom traversing fording vehicles. The distinction is accomplished by examining the seismic signal produced by a candidate target for significant characteristics unique to the specific targets.
    Type: Grant
    Filed: February 13, 1974
    Date of Patent: March 28, 1978
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: James C. Ravis, Curtis P. Hedman