Explore our expert guide to patent filing in Chicago. Get practical tips and essential insights to protect your innovations effectively.This page provides information on the types of patents and types of patent applications, and the examination process. It is understood that my invention is primarily intended to be applied to paper bags or bags of soft and not particularly durable material. Margaret Knight (1838–1914) applied for a patent using this model to demonstrate her machine that folded and pasted flat-bottomed paper bags. Margaret E. Knight was a prolific American inventor of machines and mechanisms for a variety of industrial and everyday purposes. Industrial paper bags. We offer a broad range of industrial bags optimised for high-speed filling lines and suitable for food contact. This invention provides packaging material made from starch and cellulose fiber obtained from recycled paper waste. Later still she received six patents over a span of years for machines used in the manufacturing of shoes.