Patents by Inventor Robert L. Hornbeck

Robert L. Hornbeck 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).

  • Coextrusion feedblock for making lightweight, rigid thermoplastic pipe
    Patent number: 4465449
    Abstract: Coextrusion feedblock apparatus for making multilayer, lightweight pipe wherein means are provided to convert thermoplastic material into pipe or tubing having a plurality of layers. Means are provided for adjusting the feedblock apparatus to assure thickness uniformity of the inner layer of the pipe or tubing and further, means are provided for adjusting overall wall thickness of the multilayer pipe or tubing.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: August 14, 1984
    Assignee: Borg-Warner Chemicals, Inc.
    Inventor: Robert L. Hornbeck
  • Method of making corrugated reinforced thermoplastic pipe
    Patent number: 4377545
    Abstract: Disclosed is a method of making corrugated reinforced thermoplastic pipe having interior and exterior tubes with corrugations therebetween, comprising extruding through a pipe forming die, the interior and exterior tubes of a pipe at one linear rate while extruding a third skin or ribbon at a faster linear rate whereby the third skin buckles between the interior and exterior tubes to create corrugations in the space between the two tubes.
    Type: Grant
    Filed: June 16, 1981
    Date of Patent: March 22, 1983
    Assignee: Borg-Warner Chemicals, Inc.
    Inventor: Robert L. Hornbeck