Patents by Inventor Donald E. Sweigart, II

Donald E. Sweigart, II 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 slide valve position indicator
    Patent number: 5257921
    Abstract: A closed stainless steel tube is used to provide pressure and media isolation between the core and coils of a sensor in the form of a variable core transformer. The core is connected to and moved with a slide valve of a screw compressor and its actuating piston. The current output from the secondary coil is converted into a voltage, linearized and communicated to a microprocessor for controlling the position of the slide valve and thereby the loading of the compressor.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: November 2, 1993
    Assignee: FES, Inc.
    Inventors: Jan D. Clarke, Steven A. Bennis, Buford B. Chidester, Gregory P. Klidonas, Stephen E. Klinger, Brian K. Mohlman, Donald E. Sweigart, II