Patents by Inventor David L. Flippo

David L. Flippo 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).

  • Peripheral knife gate seal
    Patent number: 5154397
    Abstract: A trapezoidal shaped peripheral seal is inserted in a trapezoidal cast peripheral groove in the valve body. A relief cut-out is disposed beneath the peripheral groove. The sealing function is effected by loading the peripheral seal with the gate so as to deflect the seal into the groove a relief cut out which places the seal in a shear mode.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: October 13, 1992
    Inventors: David L. Thomas, Timothy C. Sumrall, David L. Flippo, Samuel A. Bryan