Patents by Inventor Ronald E. Erkman

Ronald E. Erkman 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).

  • Electronic libretto display apparatus and method
    Patent number: 5739869
    Abstract: An apparatus and method for the simultaneous presentation of a performance script available in the original language or multiple translations, which can be selected by the user. In addition, other visual information such as scores and advertisements can be transmitted to each display.
    Type: Grant
    Filed: July 13, 1995
    Date of Patent: April 14, 1998
    Assignee: Figaro, Inc.
    Inventors: Patrick G. Markle, Geoffrey J.H. Webb, Ronald E. Erkman
  • System for providing a firing signal to an electrical power switch
    Patent number: 4453123
    Abstract: A system for providing a firing signal to an electrical power switch at a selectable instant during each cycle of a periodic waveform electric power source. A comparator receives a signal varying monotonically with time and a control voltage as inputs, and produces the firing signal at such time that one of these inputs first exceeds the other. The control voltage is clamped to a predetermined value to provide a minimum power output from the electrical power switch.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: June 5, 1984
    Inventor: Ronald E. Erkman