Unlike patents which expire, trademarks can be renewed and kept alive forever. The following include the main link to the USPTO trademark pages and some other links to specific USPTO trademark pages. Also there are a few links to other useful trademark information.
Trademark Manual of Examining Procedure (TMEP) This is highly recommended reading for anyone thinking they want to get a trademark registered. Do it BEFORE you come up with what you want as your trademark and you'll be way ahead of the game.
Trademark Searches (Pick the top one for a simple search. Note: this arcane system "logs you in" and requests you "log out" by ckicking a button even if you never instigate a search)
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