Who is the "Delaware-based" troll suing small companies on US5506866 currently?
Who sold the rights to said troll?
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From a patent's page on google patents you can click on Search USPTO Assignment Database to get to the USPTO records of all of the assignments from inventor to owner to owner. It is like the recording of a deed. This one's (SIDE-CHANNEL COMMUNICATIONS IN SIMULTANEOUS VOICE AND DATA TRANSMISSION) assignment record is here. It looks like it was invented by AT&T and transferred to other AT&T entities, used as collateral for loans to an AT&T spin off and recently sold
Assignor: PATENT BUSINESS DEVELOPMENT, LLC Exec Dt: 05/23/2012
Assignee: CLEARWATER INNOVATIONS, LLC 3411 SILVERSIDE ROAD, SUITE 108 WEBSTER BUILDING WILMINGTON, DELAWARE 19810 Correspondent: M. VANESSAH MELTON 800 S. AUSTIN AVE., SUITE 200 GEORGETOWN, TX 78626-5845