Patents by Inventor Geoffrey H. Bertkau

Geoffrey H. Bertkau 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).

  • Removal of malic acid from coffee by fermentation
    Patent number: 5147666
    Abstract: Malic acid is removed from coffee to provide a coffee product which will evoke a decreased gastric acid response after ingestion. Malic acid is removed by malolactic fermentation of an aqueous coffee extract, which may be a green or brown extract. A malic acid-lean extract can be used to extract malic acid from coffee solids to produce demalated coffee solids. Demalation is preferably accomplished without removing excessive amounts of chlorogenic acid. Coffee products in accordance with the invention are preferably decaffeinated.
    Type: Grant
    Filed: March 6, 1991
    Date of Patent: September 15, 1992
    Assignee: Kraft General Foods, Inc.
    Inventors: Barbara B. Doonan, Geoffrey H. Bertkau, Dennis F. Hayes, Frank Sabella, Ronald H. Skiff
  • Preparation of low calorie beer with malt extract free of yeast lethal factors
    Patent number: 4528198
    Abstract: An aqueous extract containing .alpha.-1,6 and .alpha.-1,4 carbohydrases obtained from diastatic malt is treated with an adsorbent to remove yeast lethal factors and can be used to produce a superattenuated low calorie beer. The enzyme-containing extract preferably is introduced into a pitched aerated wort during fermentation. Crude aqueous extracts of diastatic malt cannot be used because they contain factors lethal to yeast which adversely affects the yeast viability throughout the fermentation.
    Type: Grant
    Filed: September 27, 1983
    Date of Patent: July 9, 1985
    Assignee: Miller Brewing Company
    Inventors: Robert J. Mizerak, Geoffrey H. Bertkau, William F. Line, Etzer Chicoye