The Illinois General Assembly proposed a new House Bill (HB4052) that would create the Ethics in Patent Litigation Act.

The Consumer Fraud and Deceptive Business Practices Act has been amended to prohibit deceptive patent infringement demand letters.

On November 10, 2009, the Illinois Appellate Court, First District, affirmed the decision of the Circuit Court of Cook County finding, in a legal malpractice suit, that the contingent fee arrangement between the parties was not void, and that jurisdiction over the malpractice claim rested exclusively with the federal courts. 

On August 2, 2007, the Illinois Appellate Court, First District, answered two certified questions and affirmed the order of the Circuit Court of Cook County denying defendant Corbis Corporation's motion to dismiss counts III and VI of plaintiff James Brown's amended complaint.

On March 26, 1999, the Seventh Circuit of the United States Court of Appeals affirmed the district court's holding that the plaintiff could terminate the oral licensing agreement entered into with the defendant at any time.