The CLEAN ENERGY PATENT GROWTH INDEX (CEPGI), published quarterly by the Cleantech Group at Heslin Rothenberg Farley & Mesiti P.C. provides an indication of the trend of innovative activity in the Clean Energy sector from 2002 to the present. Results from the second quarter of 2013 reveal the CEPGI to have a value of 765 granted U.S. patents which is up 27 relative to the first quarter total of 738, but is down 21 relative to the quarter from one year prior. Toyota was granted the highest number of clean energy patents for the second quarter. Solar patents for the first time topped Fuel Cell patents to take the quarterly lead among technology sectors — by 37 patents.