The USPTO TESS (Trademark Electronic Search System) contains more than 3 million pending, registered, and dead trademarks of the United States. Click on "Search marks" to access the database. This search engine allows you to search the USPTO's database of registered trademarks and prior pending applications to find marks that may prevent registration due to a likelihood of confusion refusal.
Use TSDR (Trademark Status & Documents Retrieval) to retrieve status information and view and download documents for pending and registered trademarks. TSDR also displays information contained in the USPTO records regarding International Registrations and applications for International Registration filed under the Madrid system through the U.S.A. To access TSDR, simply enter a valid trademark serial number or registration number and click either the "Status" or "Documents" buttons.
Use Assignments on the Web (AOTW) to search the database of all recorded Trademark Assignment information from 1955 to the present (Trademark Assignments recorded prior to 1955 are maintained at the National Archives and Records Administration). Assignment records can also be searched in the Public Search Facility.
Searchable Trademark Official Gazette - The Trademark Official Gazette (TMOG) is published each Tuesday and contains bibliographic information and a representative drawing for each mark published, along with a list of cancelled and renewed registrations. The TMOG does not contain USPTO Notices. Information about each mark may also be found in the searchable trademark database, Trademark Electronic Search System (TESS).
To acquire trademark and/or service mark registration at the state level, applicants must file an application with the trademark office of the specific state in which protection is sought. For information about state registration requirements, applicants must contact the individual state trademark office. The USPTO maintains a link to most state trademark offices.
The World Intellectual Property Organization (WIPO) administers the "Madrid System for the International Registration of Marks." The system offers a route to trademark protection in multiple countries by filing a single application via its e-services.
Madrid Monitor is a monitoring tool that allows you to track the current status of all international applications and registrations under the Madrid System, and provides access to the WIPO Gazette of International Marks, the official publication of the Madrid System.
Tradmarkia is a free online trademark search portal, created by by Abhyanker P.C., a US-based trademark filing law firm. The site searches "more than 6 million trademarked logos, names, and slogans on the Internet."
Global Brand Database (WIPO) - Perform a trademark search by text or image in brand data from multiple national and international sources, including trademarks, appellations of origin and official emblems.
ASEAN TMview offers the possibility to explore the trademark landscape in the ASEAN region in a user-friendly and powerful way. ASEAN TMview contains information on more than 2 million trademark applications and registrations having effects in ASEAN countries, including data on trademark office, reference number, trademark name, applicant name, application date, trademark type, graphic representation, legal status, list of goods and services, class codes, etc.
TMview - Search for EU Trademarks.