Google trademarks and registered trade marks.
Basically there is a form and some money (last tiem I checked less than $100). BUT you also need to check first that nobody else is using it for a brewery. That is $$$ (friend ofmine in the mid 80's did that for an unsuccessful game he wrote, cost him around $500 I think he said for the name search).
and what you registar is the logo/name you use. Once you do that EVERY TIME you use your name, you have to mark it up right, or it can be used to say you didn't trademark it (blah blah)...
Anyhow those are the basics (for an idea) you should 1 google and then will probably 2 need to see a lawyer.