Patents by Inventor Johanne C. Dickinson

Johanne C. Dickinson 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).

  • Method for the removal of interfering substances in theophylline assays
    Patent number: 4477346
    Abstract: An apparatus for the separation of theophylline and caffeine contained in body fluids is provided. A macroreticular styrene-divinylbenzene copolymer resin activated by a protic solvent is utilized. The body fluid is eluted with water in an isocratic manner to afford a theophylline sample uncontaminated with caffeine. Such samples are useful in immunoassay procedures for the measurement of theophylline.
    Type: Grant
    Filed: April 22, 1983
    Date of Patent: October 16, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Johanne C. Dickinson, William A. Frey
  • Method for the removal of interfering substances, including caffeine, in theophylline assays
    Patent number: 4460695
    Abstract: A method for the separation of theophylline and caffeine contained in body fluids is provided. A macroreticular styrene-divinylbenzene copolymer resin activated by a protic solvent is utilized. The body fluid is eluted with water in an isocratic manner to afford a theophylline sample uncontaminated with caffeine. Such samples are useful in immunoassay procedures for the measurement of theophylline.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: July 17, 1984
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Johanne C. Dickinson, William A. Frey