The utility model patent has two rights holders, and the other party has already produced and sold this patented product. Can I apply for any rights?

Since the patents are applied together, the owner of the patentee should be the names of two people. If the other party produces and sells this product, it should pay you a part of the royalties. The two sides should have a written agreement on this issue, which is the key to all the following steps. If you want to produce, you'd better start on the basis of mutual consent. Otherwise, your business is better than his, and he will ask you for money, because the other party is already producing, and you haven't received the patent fee he gave you, which shows that he doesn't take your patent right seriously and may even sue you for infringement. So we must find him as soon as possible to sign the patent benefit distribution plan, and then talk about other things. The benefit distribution scheme can make each party benefit without pursuing the products produced by each factory, but if one party resells the patented technology to others, the other party has the right to receive the expenses of related patent rights and interests.