On the field, the Detroit Lions are always trying to defend their home field. Off the field, they are making that one of their main slogans.
ESPN Business reporter Darren Rovell reported the Lions registered the trademark for “Defend the Den” on Nov. 10, 2015, after filing to trademark the slogan on April Fool’s Day.
It is not the only phrase the Lions have trademarked recently. ESPN.com has found the Lions trademarked "One Detroit One Pride," filing for the trademark on April 23, 2015, and getting the trademark registered on Dec. 15 for clothing and T-shirts as well as stadium use.