The US Patent and Trademark Office's Patent Trial and Appeal Board (PTAB) has ruled in favor of Biogen Inc. in an important inter partes review (IPR) challenge by Mylan NV related to the multiple sclerosis pill Tecfidera (dimethyl fumarate), putting Biogen on more solid financial footing in 2020.
The company's stock price jumped 17% to close the day at $332.87.








