Check this out from the New York Times
One “horrible” summer in 1993 Unable to play with her daughter Sara, then 7, because of her myasthenia gravis, an autoimmune disorder that causes muscle weakness, a Florida inventor named Catherine Hettinger invents a prototype of a fidget spinner as way to bond with her daughter, Ms. Hettinger recently told The Guardian.
1997 Visions of Rubik’s Cubes, Koosh balls, and Pet Rocks presumably dancing in her head, Ms. Hettinger goes to Washington to secure a patent for the toy.
1997-2015 All in all, a pretty slow couple of decades on the fidget-spinner front. After Hasbro declines to market Ms. Hettinger’s invention, the patent expires in 2005. Small manufacturers, meanwhile, begin to market endless variations of the spinner, often as a therapeutic aid for children with attention deficit hyperactivity disorder, anxiety or autism, to help them focus and relieve stress. Most are three-prong or snowflake-shape devices made of plastic or metal and fitted with ball bearings, allowing them to spin between users’ fingertips. No one so far has explained why this is considered fun.
September 2016 While spinners are nothing more than a Detroit-based soul act from the early 1970s to most people, early-adopter entrepreneurs are beginning to sense a potential fidget-based gold rush. In Denver, two 20-something brothers, Mark and Matthew McLachlan, seek to raise $15,000 on Kickstarter for their “Fidget Cube.” They end up attracting more than $6 million. “We checked out what tools were available for fidgeting,” the founders told Adweek, “and we couldn’t find any that we’d feel truly comfortable using in a professional setting.””