Indeed it is (<a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&#38;Sect2=HITOFF&#38;d=PALL&#38;p=1&#38;u=/netahtml/PTO/srchnum.htm&#38;r=1&#38;f=G&#38;l=50&#38;s1=7,650,331.PN.&#38;OS=PN/7,650,331&#38;RS=PN/7,650,331" rel="nofollow">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&#38;Sec...</a>).  I'm not aware of them ever attempting to enforce it though.  There are plenty of examples of companies which hold patents that they've never enforced (IBM comes to mind).