By MEAD GRUVER, Associated Press CHEYENNE, Wyoming (AP) — "Taco Tuesday" may be a well-known term for a themed dinner night out or at home, but as restaurants across the U.S. have learned, it's also trademarked. Cheyenne-based Taco John's — which has nearly 400 locations in 23 states — put its legal stamp on "Taco Tuesday" 30 years ago and has since zinged cease-and-desist letters at offenders far