Patents by Inventor Thomas A. Edgell

Thomas A. Edgell 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).

  • Earth fracturing apparatus
    Patent number: 4289072
    Abstract: An explosive-containing casing is provided with a cap to which a nipple is secured. The nipple supports a rigid rod which extends the length of the casing and which in turn supports a detonation train for the explosives within the casing. An electrical connector arrangement is joined to the nipple to permit a conductive path to be established to a detonator which forms part of the detonation train. The nipple is secured to the cap in a manner which prevents the entry of water or other undesirable substances into the casing.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: September 15, 1981
    Assignees: Thomas A. Edgell, Roberta K. Tillinghast, James W. Fair
    Inventors: Thomas A. Edgell, Alfred R. Foote, Charles P. Steele