Patents by Inventor David E. Holloway

David E. Holloway 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).

  • Locating devices for soil displacement hammers
    Patent number: 4854398
    Abstract: A locating device for a soil displacement hammer is disclosed and comprises a cylindrical, radio wave-transparent housing which is releasably connected between an air line for the soil displacement hammer (mole) and the hammer itself so as to permit air communication through the housing. Mounted along the axis of the housing is a cylindrical radio wave transmitter, such that, when the hammer is driven through the ground by repeated pneumatic impact, its location under the ground can be detected at the surface.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: August 8, 1989
    Inventor: David E. Holloway