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 my Trademark federally? The United States Patent and Trademark Office files trademarks federally. The program provides free legal assistance to underresourced inventors interested in securing patent protection for their inventions. To apply for a patent, you must file an application and pay required fees. This research guide includes individual guides for conducting patent or trademark searches, as well as starting points for additional research. The process of filing a patent in Washington State is similar to filing a patent anywhere in the United States. The Washington Pro Bono Patent Network matches qualified low-income inventors in Washington state with experienced patent attorneys. Please include your Certificate of Completion of the USPTO's online Basic Patent Training and most recent tax return with Social Security Number obscured.