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In 1935, Parker Brothers (PB) bought the rights to Monopoly from the 'inventor', Charles Darrow. PB immediately began selling Monopoly games using the Darrow game parts.The first games Parker Brothers made were marked TRADE MARK. This included a small number of the No 9 long box, very rare today.These patents remained on all Monopoly games until 1941 when the Magie patent expired and was removed.1936 was a busy year for Parker Brothers and their Monopoly game.By the end of 1936, all the boxes with this label design were switched to the blue color.
The Number 7 game box was changed from black to blue.Parker Brothers quickly purchased that patent from Magie and put it on their Monopoly games just to cover their claim to the rights to the game.That patent number 1,509,312 replaced the Patent Pending labels. 9 white box games where games already printed 'Trade Mark' had this patent added as an overprint.Almost immediately, very early in 1936, this new patent was added to the Magie patent on all Monopoly games, replacing the single Magie patent.
These patents also appeared on the several new varieties introduced by Parker Brothers throughout 1936.
Their patent was issued on Dec 31, 1935, patent number 2,026,082.