Search within the title, abstract, claims, or full patent document: You can restrict your search to a specific field using field names. She created a machine that made flat-bottomed paper bags.Margaret E. Knight was an American inventor best known for a machine that mechanized the manufacturing of flatbottom paper bags. Margaret Knight was one of the first women to receive a patent, most notably for her invention of the flatbottomed paper bag machine. The National Inventors of Fall of Fame® honors Inductee Margaret E. Knight, who invented a machine for making flatbottom paper bags. Taught engineer, Margaret Knight invented the machine to produce flatbottomed paper bags, and then founded the Eastern Paper Bag Company in 1870. She created a machine that made flat-bottomed paper bags. This option is sold out. Now, about the patent. The first claim in a patent sets the focus of all following claims.