Patents by Inventor Don D. Duren

Don D. Duren 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).

  • High temperature slide valve
    Patent number: 4541453
    Abstract: A slide valve for use in a high temperature gas line is described. The valve is constructed to allow field assembly and disassembly for ease of service, and has insulating means and gas purge means for maintaining the exterior of the valve housing at a low temperature. The valve includes a slide plate which can be provided with a flow opening in either a first location such that the slide plate is in tension when the valve is closed while hot or in a second location such that the slide plate is in tension when the valve is opened while hot.
    Type: Grant
    Filed: November 3, 1983
    Date of Patent: September 17, 1985
    Assignee: Conoco Inc.
    Inventors: Harlan G. Graf, Harry R. Janssen, Don L. Edwards, Don D. Duren