LEUNG, H. C. C. (Inventor), LIU, J. (Inventor) & WONG, C. F. (Inventor), 29 Dec 2011, IPC No. G06-LC-Auto-US01, Patent No. US 8,520,909B2, 11 Mar 2010, Priority date 11 Mar 2009, Priority No. 13/255,241
LEUNG, H. C. C. (Inventor) & LIU, J. (Inventor), 8 Jul 2010, IPC No. G06-LC-Digi-US01, Patent No. US 8,489,571B2, 9 Jun 2009, Priority date 10 Jun 2008, Priority No. 12/480,881