However, before she could place the patent application, she found a man named Charles Annan who had studied her machine while visiting the factory was attempting to a patent machine suspiciously similar to her own. Knight, 33 at the time, filed a patent interference suit against Annan. She played to win, spending $100 a day plus expenses for 16 days of depositions of herself and other key Boston witnesses.
Gayunpaman, bago siya ilagay ang patent application, siya natagpuan ng isang tao na nagngangalang Charles Annan na aral ng kanyang machine habang pagbisita sa pabrika ay sinusubukan sa isang patent machine sa paghihinala katulad sa kanyang sariling. Knight, 33 sa panahon, file ng isang patent suit panghihimasok laban Annan.