▁tra dem ark ▁in fr ing ement ▁by ▁Parker ▁Brothers ▁in ▁ 1 9 7 4 . ▁The ▁case ▁went ▁to ▁trial ▁in ▁ 1 9 7 6 . ▁An sp ach ▁won ▁on ▁appe als ▁in ▁ 1 9 7 9 , ▁as ▁the ▁ 9 th ▁Circ uit ▁Court ▁determined ▁that ▁the ▁tra dem ark ▁Mon opol y ▁was ▁generic ▁and ▁therefore ▁un en force able . ▁The ▁United ▁States ▁Supreme ▁Court ▁decl ined ▁to ▁hear ▁the ▁case , ▁allowing ▁the ▁app ell ate ▁court ▁r uling ▁to ▁stand . ▁This ▁decision ▁was ▁over turn ed ▁by ▁the ▁passage ▁of ▁Public ▁Law ▁ 9 8 - 6 2 0 ▁in ▁ 1 9 8 4 . ▁With ▁that ▁law ▁in ▁place , ▁Parker ▁Brothers ▁and ▁its ▁parent ▁company , ▁Has bro , ▁continue ▁to ▁hold ▁valid ▁tra dem arks ▁for ▁the ▁game ▁Mon opol y . ▁However , ▁Anti - Mon opol y ▁was ▁ex empt ed ▁from ▁the ▁law ▁and ▁An sp ach ▁later ▁reached ▁a ▁settlement ▁with ▁Has bro ▁and ▁mark ets ▁his ▁game ▁under ▁license ▁from ▁them . ▁ ▁The ▁research ▁that ▁An sp ach ▁conducted ▁during ▁the ▁course ▁of ▁the ▁lit ig ation ▁was ▁what ▁helped ▁bring ▁the ▁game ' s ▁history ▁before ▁Charles ▁D arrow ▁into ▁the ▁spot light . ▁ ▁Has bro ▁ownership ▁In ▁ 1 9 9 1 , ▁Has bro ▁acquired ▁Parker ▁B ros . ▁and ▁thus ▁Mon opol y . ▁Before ▁the ▁Has bro ▁ac quisition , ▁Parker ▁B ros . ▁acted