Patents by Inventor Charles Hsaio

Charles Hsaio 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).

  • Dry sustained release theophylline oral formulation
    Patent number: 4786509
    Abstract: A sustained release theophylline containing oral dosage formulation comprising theophylline containing micropellets coated with from about 0.5% to about 2% by weight of a pharmaceutically acceptable water-insoluble film former, preferably ethyl cellulose and having first order release. The formulation is an improvement over theophylline containing micropellets coated with two film formers which have zero order release. The oral dosage formulation has superior non-fasting release and absorption characteristics when compared to the zero order release formulation.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: November 22, 1988
    Assignee: Schering Corporation
    Inventors: Richard Chang, Robert P. Giannini, Charles Hsaio