Patents by Inventor Duncan Hamilton Wormald

Duncan Hamilton 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).

  • Methods and devices for the production of a pipe from biaxialy oriented thermoplastic material having an integrated socket
    Patent number: 7069635
    Abstract: A method for forming an integral socket to a pipe made from biaxially oriented thermoplastic material is described. The pipe has a pipe body and is provided, at one or both ends, with an integral socket. The biaxially oriented thermoplastic pipe is subjected to a socket-forming operation comprising the steps of fixing both axial ends of the unheated end part of the pipe, heating the fixed end part to a suitable socket-forming temperature in one or more steps, and expanding the axially fixed end part with the aid of a fluid pressure in the interior of the end part and/or a vacuum on the outer side of the end part, which expansion may begin as early as during the heating of the end part.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: July 4, 2006
    Assignee: Wavin B.V.
    Inventors: Arjan Dirk van Lenthe, Jan Visscher, Duncan Hamilton Wormald, Jan Hendrik Prenger
  • Methods and devices for the production of a pipe from biaxialy oriented thermoplastic material having an integrated socket
    Publication number: 20040016100
    Abstract: A method for forming an integral socket to a pipe made from biaxially oriented thermoplastic material is described. The pipe has a pipe body and is provided, at one or both ends, with an integral socket. The biaxially oriented thermoplastic pipe is subjected to a socket-forming operation comprising the steps of fixing both axial ends of the unheated end part of the pipe, heating the fixed end part to a suitable socket-forming temperature in one or more steps, and expanding the axially fixed end part with the aid of a fluid pressure in the interior of the end part and/or a vacuum on the outer side of the end part, which expansion may begin as early as during the heating of the end part.
    Type: Application
    Filed: June 30, 2003
    Publication date: January 29, 2004
    Inventors: Arjan Dirk Van Lenthe, Jan Visscher, Duncan Hamilton Wormald, Jan Hendrik Prenger