Patents by Inventor Bruce I. Formhals

Bruce I. Formhals 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).

  • Three-phase SCR drive circuit using an opto-coupled pulse amplifier
    Patent number: 4048520
    Abstract: A three-phase shift network includes a single transistor which controls phase shift by introducing a variable resistance into the network as determined by a D.C. control signal supplied to the transistor. The three-phase signals generated from the phase shift network undergo pulse shaping and are subsequently introduced into an opto-coupled pulse amplifier. The amplifier drives large SCR devices, connected as a load.
    Type: Grant
    Filed: May 24, 1976
    Date of Patent: September 13, 1977
    Assignee: Vectrol, Inc.
    Inventors: Nicholas G. Muskovac, Bruce I. Formhals