Patents by Inventor Robert O. Keys

Robert O. Keys 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).

  • Ester-alcohol frothers for froth flotation of coal
    Patent number: 4504385
    Abstract: Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an ester-alcohol frothing agent. The preferred ester-alcohol frothing agents are reaction products of C.sub.1 -C.sub.10 mono-basic carboxylic acids and diols wherein the total number of carbon atoms range from about 6-19 and monocarboxylic acid esters of polyoxyalkylene glycols which can contain up to 25-30 carbon atoms.
    Type: Grant
    Filed: December 30, 1982
    Date of Patent: March 12, 1985
    Assignee: Sherex Chemical Company, Inc.
    Inventor: Robert O. Keys