Patents

5632272, 5758644, 5769785, 5919134, 6002952, 6011986, 6067462, 6229856, 6260577, 6360114, 6388240, 6430525, 6463311, 6515273, 6606511, 6643530, 6654624, 6661161, 6684090, 6699194, 6816741, 6822564, 6850787, 6861639, 6979812, 6999904, 7186966, 7215986, 7221971, 7254433, 7295866, 7355512, 7373194, 7377899, 7438683, 7467002, 7471969, 7489958, 7496393, 7499741, 7499835, 7509154, 7530955, 7764982, 7729733,7761127, 7865222, 7873497, 7988637, 7990382, 8046040, 8046041, 8046042, 8019400, 8126528, 8128572, 8150487, 8180420, 8185180, 8190227, 8203438, 8224411, 8260577, 8265723, 8280473,8337403, 8359080, 8364226, 8414499, 8457703, 8457707, 8463349, 8483787, 8489364, 8498684, 8532728, 8560032, 8570167, 8634889, 6011986, 6388240, 6397091, 6515273, 6580086, 6861639, 6979812, 7186966, 7272425, 7496391, 7596398, 7729733,7764982, 7761127, 8050728, 8355766, 8118620, 8255026, 8301217, 8399822, 8529301, 8634889 international equivalents and other patents pending.