Patents by Inventor David M. Gleason

David M. Gleason 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).

  • Time delay primer and method of using same
    Patent number: 4167139
    Abstract: A delay primer unit for detonating an explosive material in a borehole with a detonating cord down line extending into the borehole wherein the unit comprises an explosive element capable of detonating the explosive material upon being detonated, means for preventing direct detonation of the explosive element by the down line and an elongated, flexible time delay detonation element having a first end slidably connected to the down line and a second end connected in detonation relationship with the explosive element and generally movable with respect to the first end. The delay element is used to mount the explosive element on the down line.
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: September 11, 1979
    Assignee: Austin Powder Company
    Inventors: David M. Gleason, Robert V. Vickers