Money A taco chain trademarked ‘Taco Tuesday’ 30 years ago: Should they still be able to use it? August 13, 2019 Mead Gruver, Associated Press Comments Off on A taco chain trademarked ‘Taco Tuesday’ 30 years ago: Should they still be able to use it? A debate over Taco John's trademark of "Taco Tuesday" has swept through the home of the chain's headquarters, Cheyenne, Wyoming.