The inventor of fingertip gyro, Catherine Hettinger (Catherine)
Hettinger) could have earned a lot of income from patent licensing fees. However, this is not the case: she gave up the patent in 2005 because she had no money to renew it. He Tingjie from Florida didn't get any income from her invention. More than 20 years ago, she invented fingertip gyro as a toy for her 7-year-old daughter. At present, the global sales of fingertip gyroscopes have reached tens of millions, and suppliers can't even meet the huge market demand.