trademark database<p><a href="http:&#x2F;&#x2F;tmsearch.uspto.gov" rel="nofollow">http:&#x2F;&#x2F;tmsearch.uspto.gov</a><p>you should also check the state you live in. Secretary of state usually manages fictitious trade names<p>checking domain names is a good proxy also. if no one cared to buy xyz.com then they probably didn&#x27;t trademark it, etc.