Patents by Inventor Eric Ivan Johnson

Eric Ivan Johnson 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).

  • Patent number: 6309159
    Abstract: An elongate roof bolt includes a bolt body having an axially extending central bore and defining a leading end. The leading end includes a pair of axially extending abutment elements formed by machining. Each abutment element includes an abutment face for engagement with a drill tip on opposite sides thereof, to transmit rotary forces during drilling. The drill tip extends across the leading end of the bolt body and is bonded to the abutment elements by welding, soldering or brazing. The bore opens out of said bolt bonded adjacent said leading end.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: October 30, 2001
    Assignee: Sandvik AB
    Inventors: Steven Lee Weaver, Michael Andrew McLean, Eric Ivan Johnson