Patents by Inventor Catherine A. Zelaskowski

Catherine A. Zelaskowski 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).

  • Trace lead analysis method
    Patent number: 3955927
    Abstract: The trace lead content of gasoline, specifically in lead concentrations of about 0.01 to 0.10 grams of lead per U.S. gallon of gasoline, is determined colorimetrically by the steps of mixing an iodine solution with the gasoline, subjecting the mixture to ultra-violet light and adding an indicator solution containing 4-(2-pyridylazo)-resorcinol disodium salt with agitation and comparing the resulting color to standard indicator solutions.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: May 11, 1976
    Assignee: Mobil Oil Corporation
    Inventors: Catherine A. Zelaskowski, John J. Carlisi
  • Trace lead analysis method
    Patent number: 3934976
    Abstract: The lead content of gasolines, particularly in concentrations of from 0.00 to 0.10 gram of lead per U.S. gallon of gasoline, is determined colorimetrically by mixing iodine and tetraorganoammonium halide solution with the gasoline, subjecting the mixture to ultraviolet light or heat, agiating the mixture with ammonium nitrate or nitric acid, passing the aqueous phase into 4-(2-pyridylazo)-resorcinol disodium and comparing the resulting color with a standard color scale or a colorimeter to determine the initial lead concentration.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: January 27, 1976
    Assignee: Mobil Oil Corporation
    Inventor: Catherine A. Zelaskowski