Acorda Therapeutics announces issuance of additional U.S. Patent for AMPYRA® covering a range of dosage strengths Acorda Therapeutics, 20 May 2013 Accessed on 21 May 2013 from http://ir.acorda.com/phoenix.zhtml?c=194451&p=irol-newsOtherArticle&ID=1821937. CommentRecommendBookmarkWatch