Patents by Inventor Richard L. Antrim

Richard L. Antrim 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).

  • Ultrafiltration purification of glucose isomerase
    Patent number: 4618584
    Abstract: This invention relates to a process for the production of a purified glucose isomerase enzyme which comprises contacting an enzyme extract containing glucose isomerase and impurities with a first polysulfone membrane not normally permeable to glucose isomerase, in the presence of a salt concentration capable of selectively inducing permeation of glucose isomerase through the membrane, and obtaining a glucose isomerase containing permeate.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: October 21, 1986
    Assignee: Nabisco Brands, Inc.
    Inventors: Richard A. Johnson, Richard L. Antrim, Norman E. Lloyd
  • Adsorption-desorption purification of glucose isomerase
    Patent number: 4610965
    Abstract: The present invention relates to a process for the production of a purified glucose isomerase which comprises contacting an impure extract containing glucose isomerase and soluble impurities with a weakly basic ion exchange material known to adsorb glucose isomerase; adding a first salt solution of a concentration which removes unadsorbed and weakly adsorbed impurities, but not glucose isomerase; and adding a second, buffered salt solution which elutes the adsorbed glucose isomerase.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: September 9, 1986
    Assignee: Nabisco Brands, Inc.
    Inventors: Richard A. Johnson, Richard L. Antrim, Norman E. Lloyd
  • Process for preparing agglomerated fibrous cellulose
    Patent number: 4355117
    Abstract: A process is provided wherein a fibrous ion exchange cellulose composite is prepared by agglomerating a hydrophobic polymer and fibrous cellulose and then derivatizing the cellulose to impart ion exchange properties thereto. The process is an improvement over the prior art processes wherein the composite is prepared by agglomerating the polymer with fibrous cellulose which has been converted to ion exchange cellulose prior to agglomeration.
    Type: Grant
    Filed: October 8, 1980
    Date of Patent: October 19, 1982
    Assignee: Nabisco Brands, Inc.
    Inventors: Richard L. Antrim, Louis S. Hurst
  • Method for obtaining a purified cellulose product from corn hulls
    Patent number: 4239906
    Abstract: A cellulose product containing hemicellulose derived from corn hulls is treated under acidic conditions to obtain purified cellulose having present at least about 70 percent alpha-cellulose. Hemicellulose or a xylose-containing solution may also be obtained.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: December 16, 1980
    Assignee: Standard Brands Incorporated
    Inventors: Richard L. Antrim, Yuk-Charn Chan, John R. Crary, Jr., Donald W. Harris