Patents by Inventor Edward N. Alexander

Edward N. Alexander 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).

  • Process for recovery of phosphate ore
    Patent number: 4511463
    Abstract: Phosphate ore is concentrated by flotation in the presence of a half-ester of an organic dicarboxylic acid, such as maleic acid, with a saturated aliphatic alcohol containing at least 11 carbon atoms. Water and oil also are present. The half-ester may be partly neutralized, e.g. with caustic soda, in an amount at most sufficient to raise the pH to 7.0.
    Type: Grant
    Filed: December 1, 1978
    Date of Patent: April 16, 1985
    Assignee: West-Point Pepperell, Inc.
    Inventors: Edward N. Alexander, Richard Smith