Chicago firm hit by judge's ruling in patent case | Law | Crain's Chicago Business

(Crain's) — A Chicago-based firm that has made a business out of suing big-name companies for patent infringement suffered a body blow when a federal judge struck down most of the patent it has used to wring settlements out of the likes of Sears Holdings Corp. and OfficeMax Inc. Over the past five years, Card Activation Technologies Inc. has accused a who’s who of...