Most attempts to sell or license patents fail. You may apply for a patent and sell your product to a buyer without licensing any rights (to your future patent) to the buyer.Your best bet is to find an invention broker to propose your idea to a company," Clark says. The short answer is no. The licensing agreement covering the invention normally does not trigger the on-sale bar. Killtrol® is a patent drug of Clark Pharmaceuticals. However, you will likely not get full value for your invention because you don't have an issued patent or even a full application. A "sale" need not be for profit to bar a patent. Fill out the questionnaire below. Do your best to succinctly answer each question.