When you go grocery shopping, you should be thankful to Margaret E. Knight. One of her many inventions, and possibly her most famous one, was a paper-feeding machine for “making and folding square-bottom paper bags.”
Prior to this time paper bags were envelope-style, that could not hold as much and could easily tip over. The court ruled in a lawsuit against a man who tried to patent her idea first (Knight won), noting that she had conceived the idea as early as February 1867, and she had all the drawings and diagrams to prove it. She was awarded the patent on this machine on 15 November 1870. This same year she started the Eastern Paper Bag Company. Continue reading