Patents US Patents6,388,813 6,536,045 6,847,492 7,184,217 8,361,260 8,693,102 8,974,620 9,104,256 9,128,545 9,274,625 9,295,297 9,471,163 9,526,290 9,968,155 10,070,678 Canada Patent2,386,043 European Patents1502146 1517791
