Patents by Inventor William A. Frey

William A. Frey 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).

  • Patent number: 10118883
    Abstract: A method for producing levulinic acid from lignocellulosic biomass comprising hemicellulose including one or more six carbon chain compound precursors comprises the steps of hydrolyzing the lignocellulosic biomass to form a first phase comprising partially hydrolyzed lignocellulosic biomass including cellulose and lignin and a second phase comprising one or more five carbon chain sugars and one or more six carbon chain sugars from degradation of the hemicellulose, separating the first phase from the second phase, and converting at least a portion of the one or more six carbon chain sugars to levulinic acid.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: November 6, 2018
    Assignee: Georgia-Pacific LLC
    Inventors: William A. Frey, Jeffrey Wayne Brown, John Patrick Kelly, Michael Eugene Carroll, Peter Chester Guion
  • Publication number: 20150052806
    Abstract: A method for producing levulinic acid from lignocellulosic biomass comprising hemicellulose including one or more six carbon chain compound precursors comprises the steps of hydrolyzing the lignocellulosic biomass to form a first phase comprising partially hydrolyzed lignocellulosic biomass including cellulose and lignin and a second phase comprising one or more five carbon chain sugars and one or more six carbon chain sugars from degradation of the hemicellulose, separating the first phase from the second phase, and converting at least a portion of the one or more six carbon chain sugars to levulinic acid.
    Type: Application
    Filed: March 11, 2013
    Publication date: February 26, 2015
    Inventors: William A. Frey, Jeffrey Wayne Brown, John Patrick Kelly, Michael Eugene Carroll, Peter Chester Guion
  • Patent number: 4812396
    Abstract: A method is disclosed for determining enzymatic activity in a liquid sample by particle agglutination or inhibition of particle agglutination.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: March 14, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Robert A. Ballas, William A. Frey
  • Patent number: 4812395
    Abstract: A method is disclosed for determining enzymatic activity in a liquid sample by particle agglutination or inhibition of particle agglutination.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: March 14, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Robert A. Ballas, William A. Frey
  • Patent number: 4581337
    Abstract: Particle reagents, having polyether polyamine linking groups, for use in turbidimetric immunoassays are provided. These linking agents permit ready covalent attachment of compounds of biological interest to polymer particles and lead to immunoassays of improved precision.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: April 8, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William A. Frey, Donald M. Simons
  • Patent number: 4480042
    Abstract: Novel particle reagents for light scattering immunoassays are provided. The particle reagents are high refractive index shell-core polymers covalently bonded to compounds of biological interest or analogs thereof. A method of measuring unknown concentrations of these compounds of biological interest by measuring changes in turbidity caused by particle agglutination or its inhibition is also provided.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: October 30, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alan R. Craig, William A. Frey, Charles C. Leflar, Catharine E. Looney, Michael A. G. Luddy
  • 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
  • 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
  • Patent number: 4401765
    Abstract: Novel particle reagent for light scattering immunoassays are provided. The particle reagents are high refractive index shell-core polymers covalently bonded to compounds of biological interest. A method of measuring unknown concentrations of these compounds of biological interest by measuring changes in turbidity caused by particle agglutination or its inhibition is also provided.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: August 30, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alan R. Craig, William A. Frey, Charles C. Leflar, Catharine E. Looney, Michael A. Luddy