You’ve used a zipper today. Probably without looking, probably without thinking, probably before coffee. It opened your jacket or your bag or your jeans, it made a sound, and you moved on. But that little metal or plastic thing you just used is the product of an 80-year chain of missed opportunities, a grieving engineer, a rubber boot company, and a sewing machine inventor who had better things to do.
The first person to patent a device that looked an awful lot like a zipper was Elias Howe, in 1851 — the same Elias Howe who invented the lockstitch sewing machine (ThoughtCo, History of the Zipper). He called it an “Automatic, Continuous Clothing Closure.” He got the patent. And then he did absolutely nothing with it, because the sewing machine was making him rich and he had no reason to fiddle with clothing closures. So the first zipper patent sat in a drawer for 42 years, unused, while buttons and laces continued to rule the world.
Forty-two years later, in 1893, a man named Whitcomb Judson finally built something similar and debuted it at the Chicago World’s Fair as the “Clasp Locker” (Wikipedia, Whitcomb L. Judson). Judson had partnered with a Chicago mechanic to form the Universal Fastener Company, and the pitch was simple: a slide fastener for shoes that didn’t require laces. The problem was that the Clasp Locker used a complicated system of hooks and eyes, and it kept popping open at inconvenient moments. Customers were not impressed. The Chicago World’s Fair audience was not impressed. The thing was unreliable, embarrassing, and commercially unsuccessful.
Judson kept tinkering. He filed more patents. He improved the mechanism. But the fundamental problem — the hooks just wouldn’t stay hooked — remained unsolved. The company limped along for more than a decade, selling fasteners for tobacco pouches and money belts, which is a polite way of saying it was failing.
Then, in 1906, a Swedish electrical engineer named Gideon Sundback emigrated to the United States and took a job at the Universal Fastener Company in Hoboken, New Jersey (America Comes Alive, Gideon Sundback’s Invention of the Zipper). Sundback had studied electrical engineering in Germany and worked briefly at Westinghouse before landing at the struggling fastener company. He was hired to fix the thing Judson couldn’t.
Sundback was good at his job. He rose to head designer by 1909. That same year, he married Elvira Aronson, the daughter of the plant manager. They had a daughter named Ruth.
Then, in March 1911, Elvira died. She was twenty-three. The cause was complications from childbirth.
What happened next is the part of the zipper story that doesn’t make it into most history books. Sundback, according to multiple accounts, threw himself into his work with an intensity that went beyond professional duty. He sent Ruth to Sweden to be raised by family. And at the design table, he began rethinking the fastener from scratch (Portable Pieces of Thoughts, Long Live the Zipper; CMU MechE, Zipper Inventor’s Legacy).
By December of 1913, he had designed what we now recognize as the modern zipper. Sundback’s breakthrough was ditching the hook-and-eye principle entirely and replacing it with interlocking teeth — small, precisely shaped scoops of metal that nested together in a tight chain. He called it the “Hookless Fastener No. 2” (Wikipedia, Gideon Sundback).
But here’s the part that’s almost stranger than the invention itself: the manufacturing. Each tooth had to be exactly the same size, exactly the same shape, and exactly the same distance from the next one. In the 1910s, there were no machines that could do this reliably. So Sundback built his own. His “S-L machine” took a special Y-shaped wire, cut individual scoops from it, and punched dimples to create teeth — all without wasting a single scrap of metal (National Inventors Hall of Fame, Gideon Sundback). Within the first year, the factory was producing hundreds of feet of fastener per day. He had solved not just the design problem but the manufacturing problem, and those are very different things.
Even so, the public didn’t care. The Hookless Fastener was used for money belts, gloves, and tobacco pouches. Nobody was putting it on clothing. The fastener worked, but nobody could figure out what to do with it.
That changed in 1918, when the United States Navy ordered 10,000 hookless fasteners for flight suits (JSTOR Daily, How WWI Made the Zipper a Success). Pilots needed to close their suits quickly, with one hand, while wearing gloves. Buttons were too slow. Snaps were too fiddly. The hookless fastener, it turned out, was exactly what aviators needed. It was the first time the device proved itself in a context where it was genuinely better than what came before — not just a novelty, not just a convenience, but a real solution to a real problem.
The Navy’s adoption gave the fastener credibility, but it was a rubber boot company that gave it a name. In 1923, the B.F. Goodrich Company put Sundback’s fasteners on a new line of rubber boots and called them “Zippers” — after the sound the slider made when closing (Witness2Fashion, Flappers, Galoshes, and Zippers in the 1920s). The name was a trademark, originally applied only to Goodrich’s boots. But the word was so much better than “Hookless Fastener” or “separable fastener” that it stuck to the device itself, and by the 1930s everyone was calling the thing a zipper regardless of who made it.
And then there’s YKK. In 1934, a Japanese entrepreneur named Tadao Yoshida founded a small company in Tokyo that sold zippers (YKK Americas, History of the Zipper). Yoshida wasn’t an engineer and wasn’t from a manufacturing family. He was the son of a shopkeeper who had worked odd jobs before deciding, at thirty-one, that zippers were the future. He was right. Yoshida’s philosophy — which he called the “Cycle of Goodness”: no one prospers unless they render benefit to others — led YKK to bring every stage of manufacturing in-house, from smelting brass to molding teeth to weaving the fabric tape (Carryology, The Company That Zips the Globe).
Today, YKK makes roughly half of all zippers produced on Earth. Seven billion of them a year — about 3 million kilometers of zipper tape, enough to wrap around the planet 75 times (Kowide Outdoors, Why YKK?). If you’ve ever zipped anything, there’s a better-than-even chance it was theirs. If you’ve got a broken zipper at home — a jacket, a backpack, a tent — you can buy YKK replacement sliders for a few dollars and fix it yourself, which feels like the kind of thing Tadao Yoshida would approve of.
The zipper’s strangest chapter might be the one nobody talks about: NASA used them in spacesuits. The Apollo A7L suits used airtight pressure-sealing zippers developed by B.F. Goodrich for military high-altitude flight gear (Quora, How did zippers work on the Apollo spacesuits?). The zipper on a spacesuit has a rubber seal that closes between the teeth when the slider passes over it, creating an airtight barrier. It’s the same basic mechanism Sundback designed in 1913 — interlocking teeth pulled together by a slider — just scaled up and sealed with rubber so an astronaut doesn’t decompress in the vacuum of space.
So the next time you pull a zipper, you’re using a device that Elias Howe patented and ignored, that Whitcomb Judson built and broke, that Gideon Sundback perfected after losing his wife, that B.F. Goodrich named after a sound, and that YKK manufactures seven billion of per year. It took 80 years to get from the first patent to your pants. It’s been in every pocket, every jacket, every sleeping bag, and every spacesuit since. And you still never think about it.