Patents by Inventor Mark S. Rienstra

Mark S. Rienstra 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).

  • Patent number: 6071005
    Abstract: The present invention relates to a package for storing, mixing, resuspending and dispensing sterile or non-sterile solutions or suspensions and comprises a sterilizable bag having fittings which provide for the introduction and exit of fluids and solids, as well as means for resuspending and stirring the fluids. Additionally, structural support means are provided for shipment, filling and dispensing. Unlike conventional stainless steel equipment, the system is disposable, does not require cleaning, provides for safe, rapid and accurate resuspension of suspended solids and can accommodate a wide range of liquid volumes.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: June 6, 2000
    Assignee: Merck & Co., Inc.
    Inventors: Anand Ekambaram, Wendy L. Radcliff, Mark S. Rienstra, Brett L. Allred, Doyle W. Stewart
  • Patent number: 5314811
    Abstract: A process for converting lipid-containing bacterial capsular polysaccharide, such as lipo-polyribosyl ribitol phosphate, lipo-PRP, into lipid-free, endotoxin-free polysaccharide, such as polyribosyl ribitol phosphate, PRP, by solubilizing polysaccharide-containing powder derived from culture media of bacteria, such as Haemophilus influenzae type b, cleaving covalently bound fatty acids from the polysaccharide, and removing the lipids, and endotoxin.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: May 24, 1994
    Assignee: Merck & Co., Inc.
    Inventors: Ann L. Lee, Mark S. Rienstra, Walter E. Manger, Robert D. Sitrin
  • Patent number: 5045456
    Abstract: A process for removing endotoxin from Gram-negative polysaccharides such as H. influenzae polyribosylribitol phosphate by adding alcohol incrementally until substantially all lipopolysaccharide precipitates.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: September 3, 1991
    Assignee: Merck & Co., Inc.
    Inventors: Mark S. Rienstra, Edgar M. Scattergood
  • Patent number: 5039610
    Abstract: A process for removing endotoxin from Gram-negative polysaccharides such as polyribosylribitol phosphate by solubilizing polysaccharide-containing powder derived from Gram-negative bacteria fermentation broth to provide a divalent counter ion for endotoxin and adding alcohol incrementally to induce lipopolysaccharide precipition, and mixing material resulting from the alcohol addition with a nonionic resin, a detergent and a chelating agent.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: August 13, 1991
    Assignee: Merck & Co., Inc.
    Inventors: Mark S. Rienstra, Edgar M. Scattergood, Robert D. Sitrin
  • Patent number: 5019502
    Abstract: A process for removing endotoxin from Gram-negative polysaccharides such as H. influenzae polyribosylribitol phosphate by mixing with a nonionic resin, a detergent and a chelating agent.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: May 28, 1991
    Assignee: Merck & Company, Inc.
    Inventors: Mark S. Rienstra, Edgar M. Scattergood