M Minhazuddin - US Patent 7,643,414, 2010 - Google Patents
6,442,615 B1 8/2002 Nordenstam et al. 6,452,922 B1 9/2002 Ho............................. 370,352
6,581,031 B1 6/2003 Ito et al...................... TO4/222 6,665,293 B2 12/2003 Thornton et al …