Patents by Inventor Velmar E. Howard

Velmar E. Howard 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).

  • Intrinsically safe electrostatic assist units
    Patent number: 4360850
    Abstract: A high-voltage crowbar circuit continually senses the load impedance and crowbars the output voltage applied to a load if the load impedance falls below a selected value. A differentiator circuit at the load senses variations in load voltage and can trigger the crowbar operation if the voltage variation as a function of time exceeds a preselected load.
    Type: Grant
    Filed: October 30, 1979
    Date of Patent: November 23, 1982
    Assignee: HurletronAltair, Inc.
    Inventors: Velmar E. Howard, Keith K. Klett, Ernest A. Sammann, Joseph T. Verdeyen