WASHINGTON, D.C. - The U.S. Supreme Court on March 20 held that processes claimed by a patent that recites laws of nature are not patentable absent additional features providing "practical assurance" that the processes are genuine applications of those laws, rather than a drafting effort "designed to monopolize the correlations" (Mayo Collaborative Services et al. v. Prometheus Laboratories Inc., No. 10-1150, U.S. Sup.).