Patent litigation is the process through which one party sues another for making allegedly unlawful claims upon their patented invention. Under recent decisions, complaints must now clearly identify the defendant's product or activity that is accused of infringement.Together with your attorney, you will need to compile evidence of your ownership of the patent and the infringement. Enter the city or county in Texas for which you are trying to determine venue. A patent lawyer can help you protect your intellectual property rights and ensure you are not infringing on an existing patent. A stepbystep overview of a patent application and maintenance process. The five stages of a patent process. As a patent owner, you have the legal right to exclude others from making, using, selling, or offering to sell the invention. Back off the plaintiff. Take some wind out of their sails.