Patents by Inventor Philip J. Wormald

Philip J. Wormald 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).

  • Apparatus for use in drilling
    Patent number: 4332502
    Abstract: A drill element in the form of a drill rod, a sleeve for coupling together two drill rods or a drill bit; the drill element having a single start internal or external cylindrical screw thread by which it is intended to be coupled to a further drill element in the assembly of a drill string for percussion or rotary/percussion drilling.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: June 1, 1982
    Assignee: Padley & Venables Limited
    Inventors: Philip J. Wormald, Raymond J. Clemmow