Patents by Inventor Robert C. Ritchie

Robert C. Ritchie 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).

  • Refrigerant cooled plastic molding, method and apparatus
    Patent number: 4690789
    Abstract: Method and Apparatus for cooling a mold having plural parallel cooling passages therethrough, the mold having flow control means at the inlet and sight glasses at the outlets and being arranged for overfeed so that liquid is always present in all cooling passages to avoid hot spots in the mold.
    Type: Grant
    Filed: March 13, 1985
    Date of Patent: September 1, 1987
    Assignees: Dart Industries Inc., Energy Systems Industries, Inc.
    Inventors: Robert C. Ritchie, Henry J. McKone, Richard H. Stamm
  • Beveling tool for smoothing and shaping ceramic articles
    Patent number: D358751
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: May 30, 1995
    Inventors: Jacqueline A. Kemp, Robert C. Ritchie, Bruno S. Smilgys