Patents by Inventor Graham T. Wallbank

Graham T. Wallbank 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).

  • Pipe coupling
    Patent number: 5505499
    Abstract: A pipe coupling for casting into concrete comprising a sleeve having external flanges near its ends for attaching the coupling to formwork and a collar and seal ring mounted on at least one end of the sleeve for sealingly connecting at least one pipe thereto.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: April 9, 1996
    Inventor: Graham T. Wallbank