This convertible hard-top roof system patent serves to convert cars and pickups into hard-top convertibles. Do your technology research first before submitting a bid on this, but if the specs check out, then the $2.5 million could merely be considered a simple front-end cost, setting you up for a huge residual income.

The hardest part has been done for you, inventing it, now all you need to do is put this puppy into play in the market. The owner of the patent is even willing to share his preliminary marketing figures. So if you have some marketing and business savvy, then this is a great way to catapult yourself into the marketplace.