Sad that this had to go to court, but a small family owned candy shop here in MN has successfully defended its trademarked "Chicago Mix" popcorn from the big snack food companies that were stealing their name.
http://minnesota.cbslocal.com/2016/02/22/local-popcorn-maker-prevails-in-chicago-mix-battle
http://minnesota.cbslocal.com/2016/02/22/local-popcorn-maker-prevails-in-chicago-mix-battle