“YKK” stands for “Yoshida Kōgyō Kabushikigaisha” – the name of the YKK Group – which is a Japanese group of manufacturing companies. They are the world’s largest zipper manufacturer; but they also manufacture other fastening products, architectural products, and industrial machinery.
slip-sliding away..... 
Guy who invented it? Or maybe guy who patented it?
OK, since no one else wanted to guess:
As per Wikipedia:
“YKK” stands for “Yoshida Kōgyō Kabushikigaisha” – the name of the YKK Group – which is a Japanese group of manufacturing companies. They are the world’s largest zipper manufacturer; but they also manufacture other fastening products, architectural products, and industrial machinery.
wow dude you are bored!