Diers, B. (Inventor), Hill, C. B. (Inventor), Li, Y. (Inventor), Carlson, S. (Inventor) & Hartman, G. (Inventor), Mar 25 2014, U.S. Patent No. 8680364, May 31 2011
Diers, B. (Inventor), Hill, C. B. (Inventor), Li, Y. (Inventor), Carlson, S. (Inventor) & Hartman, G. (Inventor), Aug 9 2011, U.S. Patent No. 7994389, Jun 21 2005