United States In 1936, the windproof wall design of Zippo lighters was successfully patented by the U.S. government, which proved that Zippo was a precision-designed high-tech lighter. The smart rectangular shell was redesigned according to its original structure. The cover and the fuselage are connected by hinges. The design difficulties were overcome and a perforated windproof wall specially designed for ventilation was added around the fire core. . In the early 1940s, Zippo became a munitions item for the U.S. Army. With the outbreak of World War II, American soldiers quickly fell in love with it. It was well-known among soldiers for its instant wear and excellent windproof performance. In fact, in the past 65 years, Zippo's appearance has not changed much, and this patent has been developed to almost perfection. Every time you open the cover and light the fire core in strong winds, you will appreciate Zippo’s unique windproof design