Patents
1. U.S. Pat. No. 8,829,326; EP 2 095 440 B1; CA 2671995 (September 2014)
2. U.S. Pat. No. 8,808,051 (August 2014)
3. U.S. Pat. No. 8,418,342; EP 2 148 991 B1; CA 2685530 (April 2013)
4. U.S. Pat. No. 7,393,168 (July 2008)
5. U.S. Pat. No. 7,153,074 (December 2006)
6. U.S. Pat. No. 6,022,314 (February 2000)