RCW 19.77 sets out Washington's trademark registration law. Washington's law is modeled after the Model State Trademark Bill (MSTB).What is a Trademark? Here you'll find what you need to know if you know nothing about patents. We'll take you from "What is a patent?" to assistance with the application process. Usually, you can get free legal assistance for your patent from the Patent Pro Bono Program. Getting a patent in Washington is the same as any other state. The patent application is filed with the United States Patent and Trademark Office (USPTO). Information and instructions concerning filing patent applications online via EFS Web. Forms Patent application forms.