1893 (1883), Judson developed a "zipper" and obtained a patent, which is the initial prototype of the zipper. The appearance of this device has an impact on the button hooks used in high boots. However, this invention did not catch on quickly, mainly because the quality of this early locking device was not good enough, and it was easy to loosen at an inappropriate time and place, which was embarrassing.
1902, an enterprise that used to produce buttons and lace became interested in Judson's invention. They bought a patent, registered the trademark "Koubitao" and began to produce zippers installed on shoes.
However, this "crab-eating" company soon embarked on the road of destruction, and its "buckle must be properly" could not be pulled up or opened, and sometimes it suddenly stretched open, which made consumers extremely embarrassed. The discredited "button must be buttoned" became a unsalable product, and the first company that produced zippers also closed down due to losses.
19 12, Sen Debacker, an employee of Judson Company, improved this "automatic button", and changed every tooth on the chain into a convex shape and a concave shape, so that the teeth can completely bite one by one, and it is not easy to get stuck or split, and has a new name-zipper.