[simonblack]

Coincidence.

It happens all the time. Even with things that seemingly arrive 'out of the blue'.

Both the Germans and British invented jet engines within months of each other. They also both invented radar at around the same time.

I have invented things that were later patented by others, too. This was my most important, I invented it about 10 years before it was patented, but (stupidly) did nothing with it: https://www.youtube.com/watch?v=CjTa3SeKuaE

Millions of people have the same background knowledge that you do. Any one of them could have done the same as you. The thing about one-in-a-million chances is that when you have ten million opportunities you will very likely get ten hits.

[athrowaway1]

Yes in hindsight wish I got a patent in sooner. Lesson learned! Also very cool product your thought of.