A guy I worked with for many years bought the convertor everybody used to convert the computer video output to video suitable for viewing on either television channel 3 or channel 4. (the little rectangular box thingy in the Timex computer box)
Looking on the back he noticed several of the patent numbers were patents he owned! Taking his patents and the convertor to a patent attorney he was easily able to persuade the attorney the matter was worth pursuing.
Seven years later the first electronic giant agreed to settle. It took another five years for the rest of the big players to settle. He died a rich and happy man. His children are still rich and happy.

By the way, the Timex computer was also known as the Sinclair ZX81. Sinclair designed the computer and it was manufactured in a Timex factory. It was meant to be the Arduino computer of it's day.