The 4th of July is not all watermelons and fireworks. It’s also America’s most dangerous holiday, associated with some 600 deaths and more than 64,000 injuries each year. Most of these are car-related and many involve alcohol (please, please don’t drink and drive). Others are caused by summer-specific fun: swimming, sparklers and spoiled potato salad. According to the U.S. Consumer Product Safety Commission's annual fireworks report, there were about 5,600 fireworks-related injuries between June 22 and July 22 of last year.
But inventors are here to help! Here are seven historical patents plucked from the U.S. Patent and Trademark Office archives for inventions intended to make classic Independence Day activities a bit safer.
Fireworks Safety Sleeve
Fireworks have two kinds of charges—a lift charge and an effect charge. The lift charge sends the shell into the sky, then the effect charge explodes it into thousands of glittery stars. But users sometimes accidentally put fireworks shells upside-down in the launcher, which can cause the effect charge to erupt too close to the ground, injuring workers and spectators. This 2013 patent is for a polyethylene sleeve that would contain such explosions.