I guess that means the patent has expired. Which is a common fate for these things: patenting a technology means that nobody else is going to develop it if the patentor doesn't.
Zippers are in general a miracle of engineering tolerances, like LEGO. There's articles around about why YKK are considered to be the only decent manufacturer of them.
Links to MIT source: https://news.mit.edu/2026/three-sided-y-zipper-design-0504
I guess that means the patent has expired. Which is a common fate for these things: patenting a technology means that nobody else is going to develop it if the patentor doesn't.
Zippers are in general a miracle of engineering tolerances, like LEGO. There's articles around about why YKK are considered to be the only decent manufacturer of them.
If Yanko Design hadn't been around for so long, I would swear the entire site is an AI fever dream.