Patents by Inventor Henry K. Ratcliff

Henry K. Ratcliff 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).

  • Drive circuit for an ultrasonic generator system
    Patent number: 4588917
    Abstract: An ultrasonic generator system comprising a power oscillator which provides an A.C. signal for driving one or more ultrasonic transducers (TDM). The power oscillator includes a transistor (Tr.sub.1) in series wtih the parallel combination (for A.C. purposes) of a capacitor (C.sub.1) and an inductance (L.sub.1). The transducer load TDM is connected across the inductance L.sub.1 without the use of an intermediate transformer.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: May 13, 1986
    Inventor: Henry K. Ratcliff
  • Drive circuit for a plurality of ultrasonic generators using auto follow and frequency sweep
    Patent number: 4554477
    Abstract: A circuit for driving a plurality of ultrasonic transducers uses an oscillator drive means, first means responsive to the current supplied to the transducers is fed back to vary the oscillator frequency to maintain the transducer current at a maximum level, and second means, independent of the first means, are provided to cyclically sweep between upper and lower limits the oscillator frequency determined by the first means. This assures that each transducer experience resonance at least once each sweep.
    Type: Grant
    Filed: November 25, 1983
    Date of Patent: November 19, 1985
    Inventor: Henry K. Ratcliff