My patent expired some years back. I was not knowledgeable as to how to market it back then. Could I create a new version of it and patent that? I know I could easily market it, as is, on Youtube now. It is very easy to rip off though. I had paid its maintenance dues through the years, and it expired because of the 17 year life of the patent protection.
You can patent a new and improved version of your original patent if the novel claims are not obvious from your prior patent and the other prior art.