A Raghav, E Shtiegman, GS Pall, PD Tidwell - US Patent 9,031,208, 2015 - Google Patents
6,741,188 D494, 584 6,796,505 6,837.436 6,859,822 6,977,993 6,993,555 7,010,501
7,040,541 7,054,617 7,063,263 7,171,378 7, 195,157 7,385,501 7,623,643 8,311, 191 …