The USPTO public trademarks database here.
Most people use the Basic Word Mark Search. This option cannot be used to search design marks.
Search for a word contained in federally registered marks only by using the following boolean:
05.13.09 – Marijuana plants (for design code searches).
Search Trademark Trial and Appeal Board’s decisions in the TTAB Reading Room here.
Track and monitor the status of your USPTO trademark applications and registrations using the sofTMware® trademark management tool by Eric Pelton.