Patents by Inventor Cheryl Ringeisen

Cheryl Ringeisen 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).

  • Organic acids as catalysts for the erosion of polymers
    Patent number: 4780319
    Abstract: The invention relates to the use of carboxylic acids incorporated as a catalyst in poly(orthoester)s and other acid labile polymers such that upon exposure to aqueous environments the acid catalyzes the erosion of the polymer matrix. The rate of release of a drug substance incorporated into or surrounded by the poly(orthoester) or other acid labile polymer can be controlled in that the drug is released as the polymer is eroded in response to the catalytic action of the acid incorporated therein.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: October 25, 1988
    Assignee: Merck & Co., Inc.
    Inventors: Gaylen M. Zentner, Kenneth J. Himmelstein, Stefano A. Pogany, Cheryl Ringeisen