UNITED STATES PATENTS 7,786,057; 7,809,632; 7,831,503; 7,856,396; 7,912,783; 8,078,522; 8,121,935; 8,180,699; 8,285,634; 8,296,222; 8,396,786; 8,600,866; 8,600,867; 8,635,148 and patents pending in the U.S.