Patents by Inventor Alexander B. Graham

Alexander B. Graham 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).

  • Tool comprised of a holder body and a hard insert and method of using same
    Patent number: 5417475
    Abstract: A breaking or excavating tool has a diamond and/or cubic boron nitride coated cutting insert mounted at the forward end of a tool body which is made of a softer material than the insert. A separately formed retaining member such as a washer, ring or sleeve, made of harder material than the body, is brazed to a front face of the body surrounding the insert to protect the tool body against wear.
    Type: Grant
    Filed: November 3, 1993
    Date of Patent: May 23, 1995
    Assignee: Sandvik AB
    Inventors: Alexander B. Graham, Jan M. Andersson
  • Cutter picks
    Patent number: 4913125
    Abstract: A mineral cutter pick and its pick box are secured together through a spigot and socket connection. Opposed end faces of the pick and holding device that surround the connection have laterally oppositely inclined surfaces at opposite sides of a central plane of the pick extending in the direction of cutting movement. These complementary inclined faces improve the load distribution between the pick and its locking device in use and can also be arranged to restrict the entry of foreign matter into the spigot and socket connection.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: April 3, 1990
    Assignee: Sandvik AB
    Inventors: Derek J. Bunting, Alexander B. Graham