BuyerLeverage Email Solutions [NPE] filed suit against AT&T, Cisco, Comcast, Knology, Microsoft, Surewest, Time Warner Cable, and Yahoo over five patents related to spam-filtering software for email services.  BuyerLeverage is controlled by Mark Landesmann, who is also the inventor of the patents-in-suit.  The company received $925,000 in funding from Access Technology Capital in 2002, and an undisclosed amount of second round financing in 2004 from investors including Regis Management Company. 7/21, District of Delaware, 1:2011cv00645.