Patents by Inventor James L. Karraker

James L. Karraker 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).

  • Kiln construction
    Patent number: 4659356
    Abstract: An apparatus for and method of adjusting the effective length of a rotary kiln. Preheating gas enters the kiln, passes over a portion of the material to be heated and exits the kiln through an axially extending exhaust duct. Changing the length of the duct modifies the amount of time the material is subjected to direct heating by the gas so that the effective heating length of the kiln is changed.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: April 21, 1987
    Assignee: PPG Industries, Inc.
    Inventors: Robert A. Lawhon, James L. Karraker