PALO ALTO, Calif.--(BUSINESS WIRE)--StemCells, Inc. (NASDAQ:STEM) announced today that the U.S. Patent and Trademark Office (PTO) has upheld the validity of the remaining two neural stem cell patents which were subjected to reexamination proceedings commenced by Neuralstem, Inc. The upheld patents are the subject of two related lawsuits initiated by StemCells against Neuralstem, which allege infringement of a total of six patents. These six patents collectively claim the manufacture and use of human neural stem and progenitor cells as tools for drug discovery and as therapeutic agents. The PTO’s decision to uphold the two patents is final and cannot be appealed. Consequently, StemCells is asking the federal district court in Maryland to resume the infringement lawsuits against Neuralstem.
