date:Jun 27, 2012
in chewing gum, which was filed in 1989.
Wrigley meanwhile holds a US patent for a menthol/WS-23 combo in chewing gum, which was filed in 2000.
After Wrigley filed its patent, Cadbury reformulated some of its gum to contain WS-23. Wrigley then filed a suit against Cadbury in a district court in Illinois, accusing Cadbury of infringing its patent.
Cadbury counterclaimed, arguing that Wrigley had infringed its original patent filed in 1989.
Original district court judgement
The district cour