Patents by Inventor William T. Sengpiel

William T. Sengpiel 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).

  • Air purification system
    Patent number: 5061296
    Abstract: An air purification system for subjecting air to a complex electrical field including sensors and a monitor/controller for monitoring effectiveness, operational conditions of the electrical field and the system, and ambient conditions of the air being purified. The level of the high voltage, RMS and high frequency is processed so that frequency, RMS and high D.C. can be measured at a low D.C. voltage.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: October 29, 1991
    Assignee: CRS Industries, Inc.
    Inventors: William T. Sengpiel, Philip J. Doucet