Patents by Inventor Richard C. Stewart

Richard C. 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).

  • Preparation and use of enzyme-detergent extracted Streptococcus zoopidemicus vaccine
    Patent number: 5583014
    Abstract: A vaccine effective against S. zooepidemicus-caused infections is made by enzymatic digestion of S. zooepidemicus and subsequent detergent treatment of the product of this digestion. The antigenic material thus obtained is then combined with an appropriate adjuvant.
    Type: Grant
    Filed: July 3, 1990
    Date of Patent: December 10, 1996
    Assignee: Bayer Corporation
    Inventors: Karen K. Brown, Sharon A. Bryant, Richard C. Stewart, Richard E. Parizek
  • Influenza vaccine production in liquid cell culture
    Patent number: 4500513
    Abstract: Infectivity and replication of influenza viruses in successive numbers of cells of the same liquid cell culture is assured by including a protein hydrolyzing enzyme in the culture during virus incubation. Technique overcomes "one-step growth cycle" of virus and allows commercial influenza vaccine production from liquid cell cultures instead of from more costly embryonated chicken eggs. Resulting vaccine is thus substantially free of egg proteins.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: February 19, 1985
    Assignee: Miles Laboratories, Inc.
    Inventors: Karen K. Brown, Richard C. Stewart
  • Titration of serum influenza antibody using plaque reduction neutralization test
    Patent number: 4315073
    Abstract: Influenza antibody levels in serum can be measured via plaque reduction neutralization (PRN) technique. Test is more sensitive and specific for measuring anti-infective influenza antibodies than present hemagglutination inhibition (HAI) test and can be used for measuring seronegativity or suceptibility to infection.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: February 9, 1982
    Assignee: Cutter Laboratories, Inc.
    Inventors: Karen K. Brown, Richard C. Stewart
  • Curb box with snap-on base
    Patent number: 4310015
    Abstract: The invention pertains to a synthetic plastic underground valve curb box assembly consisting of a vertically oriented casing adapted to enclose a buried valve wherein a base is associated with the curb box upon which the valve rests. The casing and base are locked together by "snap-on" connecting means wherein the casing may be pushed upon the base and automatically locks thereto by resiliently biased connectors, and the base permits a greater degree of valve support than previously attainable, the base being usable with both metal and plastic conduit valves.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: January 12, 1982
    Inventors: Robert C. Stewart, Richard C. Stewart
  • Influenza vaccine production in liquid cell culture
    Patent number: RE33164
    Abstract: Infectivity and replication of influenza viruses in successive numbers of cells of the same liquid cell culture is assured by including a protein hydrolyzing enzyme in the culture during virus incubation. Technique overcomes "one-step growth cycle" of virus and allows commercial influenza vaccine production from liquid cell cultures instead of from more costly embryonated chicken eggs. Resulting vaccine is thus substantially free of egg proteins.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: February 13, 1990
    Assignee: Mobay Corporation
    Inventors: Karen K. Brown, Richard C. Stewart