Patents by Inventor Charles E. Donegan

Charles E. Donegan 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).

  • Dewatering composition
    Patent number: 4191655
    Abstract: The present invention relates to the drainage or dewatering of ore concentrates and more particularly to an improved method for dewatering as by filtration, to produce solids which have a desirably low moisture content and which are readily and easily handled by conventional methods of materials handling. The method employs the use of linear or branched alkyl ethoxylated alcohols as dewatering aids.
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: March 4, 1980
    Assignee: Betz Laboratories, Inc.
    Inventors: John E. Quinn, Lawrence S. Wittenbrook, Charles E. Donegan
  • Dewatering ore concentrates with branched alkyl ethoxylated alcohol
    Patent number: 4156649
    Abstract: The present invention relates to the drainage or dewatering of ore concentrates and more particularly to an improved method for dewatering as by filtration, to produce solids which have a desirably low moisture content and which are readily and easily handled by conventional methods of materials handling. The method employs the use of linear or branched alkyl ethoxylated alcohols as dewatering aids.
    Type: Grant
    Filed: February 22, 1978
    Date of Patent: May 29, 1979
    Assignee: Betz Laboratories, Inc.
    Inventors: John E. Quinn, Lawrence S. Wittenbrook, Charles E. Donegan