Patents by Inventor Keith Alan Cramer

Keith Alan Cramer 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).

  • Modification of copper/iron selectivity in copper solvent extraction systems
    Patent number: 8349208
    Abstract: Processes for improving copper/iron selectivity in a solvent extraction circuit by contacting an acidic aqueous solution containing dissolved copper and iron ions with a solvent extraction composition including an orthohydroxyaryloxime, a selectivity modifier, and an equilibrium modifier, wherein the ratio of selectivity modifier to orthohydroxyaryloxime is from 0.001 to 0.05, thereby decreasing the copper:iron transfer ratio, are provided herein.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: January 8, 2013
    Assignee: Cytec Technology Corp.
    Inventors: Owen Stewart Tinkler, Keith Alan Cramer, Peter Eric Tetlow, John Campbell, Charles J. Maes
  • MODIFICATION OF COPPER/IRON SELECTIVITY IN COPPER SOLVENT EXTRACTION SYSTEMS
    Publication number: 20120282156
    Abstract: Processes for improving copper/iron selectivity in a solvent extraction circuit by contacting an acidic aqueous solution containing dissolved copper and iron ions with a solvent extraction composition including an orthohydroxyaryloxime, a selectivity modifier, and an equilibrium modifier, wherein the ratio of selectivity modifier to orthohydroxyaryloxime is from 0.001 to 0.05, thereby decreasing the copper:iron transfer ratio, are provided herein.
    Type: Application
    Filed: July 12, 2012
    Publication date: November 8, 2012
    Applicant: CYTEC TECHNOLOGY CORP.
    Inventors: Owen Stewart Tinkler, Keith Alan Cramer, Peter Eric Tetlow, John Campbell, Charles J. Maes
  • Modification of copper/iron selectivity in copper solvent extraction systems
    Patent number: 8282857
    Abstract: A solvent extraction composition comprising one or more orthohydroxyarylaldoximes and/or one or more orthohydroxyarylketoximes, and one or more selectivity modifiers consisting of phosphinic and/or phosphonic acids, and salts and esters therefore and optionally one or more equilibrium modifiers is provided.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: October 9, 2012
    Assignee: Cytec Technology Corp.
    Inventors: Owen Stewart Tinkler, Keith Alan Cramer, Peter Eric Tetlow, John Campbell, Charles J. Maes