Patents Represented by Attorney John J. Karasak

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  • Process to measure PPB levels of dissolved copper in jet fuels and other non-aqueous fluids using a colorimetric process
    Patent number: 7378281
    Abstract: A method of measuring the concentration of metal ions in a sample comprising the steps of: providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a metal ion; adding a dye such as a spirobenzopyran dye or bathocuproine and a reducing agent to the sample; wherein the dye forms a complex with the metal ion; wherein the complex has a spectral shift in light absorbance relative to the dye; observing the spectral shift; and calculating the concentration of the metal ion in the sample.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: May 27, 2008
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Robert E Morris, Qin Lu, Gregory E Collins