The phrase A PARKER TRADING GAME was added to the box tops in 1937. When the 1924 patent expired in 1941, they dropped that number from the labels and used only the later patent issued to them. The new patent was added to the labels and games produced from 1936 - 1941 included both patents printed on the labels. Their patent was issued on Dec 31, 1935, patent number 2,026,082. In the meantime, PB applied for their own patent on Monopoly. To protect their investment in Darrow's Monoply game, they decided to purchase the 1924 patent to the Landlords game and added that patent to their Monopoly games. This statement was used for a while in 1935, but they discovered that there were other games very much like Monopoly already with patents. Over 100,000 games were produced with this label. Parker Brothers applied for their own patent and the next group of their games stated PATENT PENDING or PATENT APPLIED FOR. This included a small number of the No 9 long box, very rare today. About 24,000 - 25,000 of these were maunfactured.

The first games Parker Brothers made were marked TRADE MARK. PB immediately began selling Monopoly games using the Darrow game parts. This included Darrow's inventory of game parts. In 1935, Parker Brothers (PB) bought the rights to Monopoly from the 'inventor', Charles Darrow. HOW OLD IS MY MONOPOLY GAME? EARLY MONOPOLY GAME BOX DESIGNS

Original monopoly board 1946