Patent Pro Bono Program
Puerto Rico inventors are served by the Federal Circuit Bar Association National Clearinghouse, part of the USPTO's nationwide pro bono program that matches inventors who qualify (based on income) with volunteer attorneys and patent professionals that will help you file your patent application.
Law school clinics
Puerto Rico inventors and entrepreneurs can obtain free legal help for both patent and trademark matter by contacting the University Puerto Rico Law School Clinic: Eugenio.firstname.lastname@example.org
This is part of a nationwide law school clinic program that provides patent and trademark applicants with assistance from law school students working under close supervision of their faculty supervisors. There are 19 clinics that serve the entire United States and Puerto Rico.