National Women's History Museum
Margaret Knight invented a machine that created flat-bottomed paper bags (the kind still used in grocery stores) but while the first model was being built, a man named Charles Annan stole her idea and patented the machine. Knight took Annan to court and, in a rare turn of events for a woman at the time, she won the suit and was awarded the patent in 1871. Knight went on to receive at least 27 more patents in her lifetime (some sources say she held more than 80).
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