Patents by Inventor James G. McCain

James G. McCain 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 reducing volatile content of sewage sludge and other feed materials
    Patent number: 5263267
    Abstract: Apparatus for the drying of sludges and other fouling feed materials. A rotary screw type indirect heat exchanger is provided having at least one screw member. The screw member includes a helical-shaped flight having a helix angle of about 10 degrees or less and a surface roughness of about 63 micro-inches or less. Means are provided for rotating and heating the screw member and for spreading feed material onto the screw member. The apparatus operates at heat transfer rates and for a time period sufficient to reduce the moisture content of the feed material without requiring mechanical cleaning of feed material foulants from the screw member.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: November 23, 1993
    Assignee: Judco Manufacturing, Inc.
    Inventors: Thomas E. Buttner, Christopher A. Mc.Clure, H. Judson Buttner, deceased, James G. McCain, Arnold B. Nordstrom, R. Leon Williams