Patents by Inventor Keith E. Iholts

Keith E. Iholts 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).

  • PWM inverter controller with wave form memory
    Patent number: 5404089
    Abstract: A programmed PWM controller for controlling an inverter is provided which includes memory means for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word including a driveword and a drivetime word, the drivewords being used to operate the inverter; first digital means for selectively retrieving each of the plurality of drive data words from the memory means according to the pulsewidth modulation sequence in response to a next drive data word request signal; and second digital means governed by the drivetime word for generating the next drive data word request signal.
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: April 4, 1995
    Assignee: Simmonds Precision Engine Systems, Inc.
    Inventors: David F. Flanagan, Keith E. Iholts, John R. Lindbery
  • PWM inverter controller with waveform memory
    Patent number: 5400237
    Abstract: A programmed PWM controller for controlling an inverter is provided which includes memory means for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word including a driveword and a drivetime word, the drivewords being used to operate the inverter; first digital means for selectively retrieving each of the plurality of drive data words from the memory means according to the pulsewidth modulation sequence in response to a next drive data word request signal; and second digital means governed by the drivetime word for generating the next drive data word request signal.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: March 21, 1995
    Assignee: Simmonds Precision Products, Inc.
    Inventors: David F. Flanagan, Keith E. Iholts, John R. Lindbery