RCW 19.77 sets out Washington's trademark registration law. Washington's law is modeled after the Model State Trademark Bill (MSTB).How do I file a Trademark Registration? See RCW 19.77 for guidance and what is required to register a Trademark in the State of Washington. Log in to access forms. Select the type of form listed below for direct links to TEAS and TEASi forms. The US Patent and Trademark Office (USPTO) is the agency responsible for granting US patents and registering trademarks. File a trademark application and other documents online through TEAS. Trademark registration in Washington, our Attorneys will process your trademark application in Washingtonian Patent and Trademark Office. Procedure for Applying for Registration.