Any person who adopts and uses a mark in Maryland may file in the Office of the Secretary of State an application for registration of the mark. Log in to access forms.Select the type of form listed below for direct links to TEAS and TEASi forms. Contact the office at (410) 767-1184, or the Maryland Business Express link on the website DAT.Maryland.gov. 2. File a trademark application and other documents online through TEAS. The US Patent and Trademark Office (USPTO) is the agency responsible for granting US patents and registering trademarks. We can attend to preparing and filing a US Trademark Application. We can also advise on what rights you may already have based on actual use. Trademark Search Aids. Trademark Information Network - USPTO Videos explaining US trademark searching and how to file an application.