Patents by Inventor John Colin Braithwaite

John Colin Braithwaite 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 cleaning apparatus
    Patent number: 4011690
    Abstract: An apparatus for cleaning the surface of a pipeline by grit blasting, particularly the surface of a leaking bell and spigot joint, prior to encapsulating the joint for leak sealing purposes. The apparatus is mounted to the pipeline and has drive means to both move the apparatus around the pipeline and reciprocate the grit blasting nozzle.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: March 15, 1977
    Assignee: British Gas Corporation
    Inventors: John Colin Braithwaite, John Lawton Edwards