Patents Assigned to Johnson Matthey Public Limited Compnay
  • Method for making analgesics
    Patent number: 7851482
    Abstract: Improved analgesic oxymorphone hydrochloride contains less than 10 ppm of alpha, beta unsaturated ketones and pharmaceutical preparations comprising such oxymorphone hydrochloride. The oxymorphone hydrochloride is produced by reducing a starting material oxymorphone hydrochloride using gaseous hydrogen and under specified acidity, solvent system and temperature conditions. A specific polymorph of oxymorphone hydrochloride may be obtained by hydration.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: December 14, 2010
    Assignee: Johnson Matthey Public Limited Compnay
    Inventors: Jen-Sen Dung, Erno M. Keskeny, James J. Mencel