Patents by Inventor Roger P. Nelson

Roger P. Nelson 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).

  • Immobilized microbial cells
    Patent number: 3957580
    Abstract: Immobilized microbial cells are prepared by treating microbial cells with a polyfunctional cross-linking reagent and contacting the treated cells in aqueous medium with a water insoluble particulate polymer prepared by polymerizing an ethylenically unsaturated monomer. Alternatively, the treated cells may be bonded to the monomer prior to polymerizing.
    Type: Grant
    Filed: March 27, 1974
    Date of Patent: May 18, 1976
    Assignee: Pfizer Inc.
    Inventor: Roger P. Nelson
  • 18.beta.-Glycyrrhetinic acid amides useful as antiulcer agents
    Patent number: 3934027
    Abstract: Amide derivatives of 18.beta.-glycyrrhetinic acid and its 3-alkanoyl derivatives useful as antiulcer agents wherein the amide is derived from an amino acid.
    Type: Grant
    Filed: June 24, 1974
    Date of Patent: January 20, 1976
    Assignee: Pfizer Inc.
    Inventors: Hans-Jurgen E. Hess, Roger P. Nelson