Patents by Inventor J. Walter Enyeart

J. Walter Enyeart 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).

  • Hinged bridging plug for explosive placement holes
    Patent number: 4132172
    Abstract: A bridging plug for a circular blast hole has a relatively longer major axis and a relatively shorter minor axis. The plug is hinged to pivot about the minor axis. A tension line is secured to the minor axis for lowering the plug into an explosive placement hole. The plug pivots into an angular open position when lowered into the hole. An upward force on the tension line jams the hinged portions of the plug in a closed position to plug the hole. An explosive charge can be placed in the hole at the location defined by the closed plug.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: January 2, 1979
    Assignee: Occidental Oil Shale, Inc.
    Inventors: Ned M. Hutchins, J. Walter Enyeart, Leon G. Holbrook