That doesn't always work, there are patent trolls out there that are listed on the stock exchanges, if you want to learn a bit more that, watch the video I ran across last evening, 'Why the U.S. Patent System is literally SCAM! | The Patent Scam | FD Finance' The patent office is allowing the patent of ideas, someone could make an unbelievable vague patent that covers the use of the those lasers and sue anyone that uses them, the lawyers said it could cost you three years and $3M to win against the trolls!Ah, but it is easy to prove that one designed an engine when it is presented HERE as an original. It has a date and it has thousands of witnesses. The onley thing is, is it truely an original design? That is, could it have been copied from someone elses design? In the 60s, remember, there were two fellows who came up with a design for the first laser. The guy with the NAPKIN design from a restaurant won the lawsuit. The two guys partnered up in the end. A-OK.