Ribi ImmunoChem regulatory update

RIBI (Hamilton, Mont.) said the U.S. Patent and Trademark Office upheld RIBI's U.S. Patent No. 4,912,094 covering the process of preparation and utility of MPL monophosphoril lipid A, a stimulant of cell-mediated immunity. The original '094 patent, issued in March 1990, had been the subject of a request for re-examination that was initiated by an undisclosed party in June 1992. ...