U.S. federal trademark · Serial No. 77348056 · Reg. No. 1185957
Software feature of gaming machines that when a free game occurs, it triggers any "wild" symbol on the screen to move down one spot lower for each consecutive spin, until it falls off the reels and does not come into play again
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.