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US7571571 -  Aug 11, 2009 
US7540115 -  Jun 02, 2009 
US20080282622 -  Nov 20, 2008 
US7174678 -  Feb 13, 2007 
US7104023 -  Sep 12, 2006 
US7055287 -  Jun 06, 2006 
US20050258722 -  Nov 24, 2005 
US6895715 -  May 24, 2005 
US20050102912 -  May 19, 2005 
US6837384 -  Jan 04, 2005 
US6742307 -  Jun 01, 2004 
US20040093805 -  May 20, 2004 
US20030182881 -  Oct 02, 2003 
US6615551 -  Sep 09, 2003