Re: When you think you have a good idea...
Frustrating huh? Here's a couple I "invented" before I knew there was one:
Integral infant car seats. Chrysler came out with these a year after I drew one on a napkin. Came to me on an Airplane when watching people lug them around.
Continuously Variable Transmission. I even called it a CVT, and drew up a belt design with inverted cones. Much like they are actually made.
:facepalm: