Cos. Spar Over PTO Re-Exam Of Stem Cell Patents

By Jocelyn Allison (April 15, 2008, 12:00 AM EDT) -- The U.S. Patent and Trademark Office has ruled on two of four neural stem cell patents at the center of a dispute between biotech firm StemCells Inc. and rival Neuralstem Inc., but the two parties disagree over how extensively the claims have been amended....

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