R Panwar, D Goel, S Jagannadhan - US Patent 8,571,023, 2013 - Google Patents
4,215,402 A 7, 1980 Mitchell et al. 5,473,607 A 12/1995 Hausman et al. 5,495,476 A 2f1996
Kumar 6,073,160 A 6/2000 Grantham et al. 6,157,955 A 12/2000 Naradet al. 6,212,184 B1 …