Patents by Inventor John C. Dimmer

John C. Dimmer 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).

  • Method and apparatus for shaping a normally rigid plastic pipe
    Patent number: 3986810
    Abstract: A normally rigid plastic pipe is shaped by softening a selected zone of the pipe, inserting into the softened zone a resiliently deformable mandrel and pressing axially on opposite sides of the mandrel. This expands the mandrel radially into frictional engagement with the softened pipe zone. Contemporaneously the mandrel is shortened axially, thereby correspondingly expanding radially and shortening axially the softened portion of the pipe while proportionately thickening its side walls.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: October 19, 1976
    Assignee: Western Plastics Corporation
    Inventors: Harvey W. La Branche, John C. Dimmer