Patents by Inventor Henry K. Kwan

Henry K. Kwan 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).

  • Stable extended release oral dosage composition comprising loratadine and pseudoephedrine
    Patent number: 5314697
    Abstract: A film-coated extended release oral dosage composition containing the nasal decongestant pseudoephedrine sulfate in a unique polymer matrix core and a film-coating on such core containing the non-sedating antihistamine, loratadine, and use of the said composition for treating patients showing the signs and symptoms associated with upper respiratory diseases and nasal congestion are disclosed.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: May 24, 1994
    Assignee: Schering Corporation
    Inventors: Henry K. Kwan, Stephen M. Liebowitz
  • Biologically stable alpha-interferon formulations
    Patent number: 4496537
    Abstract: The addition of glycine or alanine prior to lyophilization significantly improves the biological stability of alpha type interferon formulations.
    Type: Grant
    Filed: September 16, 1983
    Date of Patent: January 29, 1985
    Assignee: Schering Corporation
    Inventor: Henry K. Kwan