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Assignments on the Web - Trademarks (USPTO)
Trademarks can (and do) change ownership - this database tracks changes back to 1955.
Trademark Electronic Search System (TESS) (USPTO)
"...searching of existing (USPTO) trademark application and registration information."
WIPO Global Brand Database
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.
WIPO Global Design Database
A world-wide collection of industrial designs data; including WIPO Hague registrations and information from participating national offices.
"...a free searchable trademark database that covers US registered trademarks from 1881 to present."
Searches more than 6 million trademarks filed since 1870.