Inventors have devoted some attention to the celebration of Flag Day. U.S. Patent No. 4,972,794 on a Flagstaff with Protective Housing is the result. As the Abtract explains:

More recently, U.S. Patent No. 9,672,761 on a Flag and Banner Display System for Motor Vehicles and the Like, reviewed the law before disclosing a way of displaying a flag on a vehicle: