Can you re-patent an expired patent of yours?

You are conflating two unrelated patent concepts. Suppose you have a patent. Now you want to file another patent for that same thing. You can't, and it seems you recognized that. read more

You are conflating two unrelated patent concepts. Suppose you have a patent. Now you want to file another patent for that same thing. You can't, and it seems you recognized that. But your question suggests that you can't patent it again because the first patent is still pending. That is not the reason. read more

In general, if a patent is expired then you can use it freely, for it become a public technology. So, the first thing you need to check is if the patent is actully expired now. For security reason, you may need to further check if there are other forms of IP rights related to this patent, for example, an improvement technology that patented which originated from this patent, trademark rights, even copyrights. read more

If a patent is no longer in force due to its owner unintentionally missing a maintenance payment the owner can petition for its revival. If it expired at the end of its term it is done. If you are a third party looking to take over a lapsed patent that you had nothing to do with, then it is a very big no. read more