The Mathilda and Terence Kennedy Institute of Rheumatology Trust filed its lawsuit in federal court in Delaware, seeking royalties and damages from Wyeth and Amgen for infringing a patent for treating arthritis. The drug makers jointly market Enbrel, a best-selling med, for treating rheumatoid arthritis. In its lawsuit, the trust alleges its 2001 patent was developed by Marc Feldmann and Ravinder Maini, both with the Imperial College London. The patent relates to treating arthritis by co-adm