REUTERS: A U.S. appeals court on Monday invalidated Acorda Therapeutics Inc patents covering its multiple sclerosis drug Ampyra, opening the door for generic competition for Acorda's flagship product.
The U.S. Court of Appeals for the Federal Circuit affirmed a lower court ruling that four Acorda patents on Ampyra were invalid because they described obvious ideas. Japanese generic drugmaker Hikma Pharmaceuticals had challenged the validity of the patents.
Acorda's stock dropped more than 22 percent to US$21.40 after the ruling.
(Reporting by Jan Wolfe; Editing by Bill Berkrot)