 During his lifetime , Seaborg is said to have been the author or co @-@ author of numerous books and 500 scientific journal articles , many of them brief reports on fast @-@ breaking discoveries in nuclear science while other subjects , most notably the actinide concept , represented major theoretical contributions in the history of science . He held more than 40 patents – among them the only patents ever issued for chemical elements , americium and curium , and received more than 50 doctorates and honorary degrees in his lifetime . At one time , he was listed in the Guinness Book of World Records as having the longest entry in Marquis Who 's Who in America . In February 2005 , he was posthumously inducted into the National Inventors Hall of Fame . His papers are in the Library of Congress . 
