Patents by Inventor Robert Joseph Stewart

Robert Joseph Stewart 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 preparing brewers wort
    Patent number: 7172775
    Abstract: A method for predicting late fermentation production of diacetyl in a brewing process comprises determining the ratio of FAN (free amino nitrogen content) to sugar (fermentable) to specific gravity in an initial wort composition. In addition there is provided a process for preventing incipient late fermentation production of diacetyl in a brewing process, comprising measuring and variously adjusting the initial FAN, sugar and specific gravity of the wort such that the ratio [ f . sugar ? ( g / L ) ] initial [ FAN ? ( g / L ) ] initial ? [ Gravity ? ( °P ) ] initial , for the adjusted wort has a value of 37 or less.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: February 6, 2007
    Assignee: Labatt Brewing Company Limited
    Inventors: Erin Ellice Petersen, Argyrios Margaritis, Robert Joseph Stewart, Phyllis Heather Pilkington, Michael J. McGarrity, Normand Anthony Mensour, Clemens Forster, Jadwiga A. Sobczak
  • Methods, processes and wort compositions related to vicinal diketone evolution and especially diacetyl formation in brewing
    Publication number: 20030087000
    Abstract: A method for predicting late fermentation production of diacetyl in a brewing process comprises determining the ratio of FAN (free amino nitrogen content) to sugar (fermentable) to gravity in an initial wort composition. In addition there is provided a process for preventing incipient late fermentation production of diacetyl in a brewing process, comprising measuring and variously adjusting the initial FAN, sugar and gravity of the wort such that the ratio 1 [ f .
    Type: Application
    Filed: October 15, 2002
    Publication date: May 8, 2003
    Inventors: Erin Ellice Petersen, Argyrios Margaritis, Robert Joseph Stewart, Phyllis Heather Pilkington, Michael J. McGarrity, Normand Anthony Mensour, Clemens Forster, Jadwiga A. Sobczak
  • Treatments for improved beer flavor stability
    Patent number: 6514542
    Abstract: This invention is directed to the prevention of the production of skunky thiols upon exposure of beer to ultraviolet or visible light. Preferably, the invention is directed to the removal or inactivation of one or more of the reactants that are present in beer that bring about skunky thiol formation, particularly the removal of flavin reactants, especially riboflavin, or to the prevention of the light excitation of such reactants.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: February 4, 2003
    Assignee: Labatt Brewing Company Limited
    Inventors: Michael Jerome McGarrity, David Jack Maradyn, Robert Joseph Stewart, Amanda Mary Tinginys, Donald James Thompson
  • TREATMENTS FOR IMPROVED BEER FLAVOR STABILITY
    Publication number: 20020106422
    Abstract: This invention is directed to the prevention of the production of skunky thiols upon exposure of beer to ultraviolet or visible light. Preferably, the invention is directed to the removal or inactivation of one or more of the reactants that are present in beer that bring about skunky thiol formation, particularly the removal of flavin reactants, especially riboflavin, or to the prevention of the light excitation of such reactants.
    Type: Application
    Filed: December 17, 1999
    Publication date: August 8, 2002
    Inventors: Michael Jerome McGarrity, David Jack Maradyn, Robert Joseph Stewart, Amanda Mary Tinginys, Donald J. Thompson