Cloud Satchel added Kobo to its campaign against makers of tablets and e-readers. The patents-in-suit originated from Xerox and were assigned to Advanced EScreens in January 2013.  The asserted patents relate to electronic documents (5,862,321; 6,144,997). Cloud Satchel sued Amazon and Barnes & Noble in May and Sony in August. 11/12, District of Delaware, 1:13cv01890