What is a Trademark?
A trademark is a word, name, symbol or device which is used in trade with goods to indicate the source of the goods and to distinguish them from the goods of others. A servicemark is the same as a trademark except that it identifies and distinguishes the source of a service rather than a product. The terms "trademark" and "mark" are commonly used to refer to both trademarks and servicemarks.
What Do Trademarks Do?
Trademark rights may be used to prevent others from using a confusingly similar mark, but not to prevent others from making the same goods or from selling the same goods or services under a clearly different mark. Trademarks which are used in interstate or foreign commerce may be registered with the U.S. Patent and Trademark Office, and most trademarks can also be registered in specific states. You do not need to register a trademark in order to hold rights in the mark, however. You can establish rights in a mark based on your legitimate use of the mark in a business or commercial setting.
Using Trademark Symbols
Any time you claim rights in a mark, you may use the "TM" (trademark) or "SM" (service mark) designation to alert the public to your claim, regardless of whether you have filed an application for registration of the mark. However, you may use the federal registration symbol "®" only after the U.S. Patent and Trademark Office actually registers a mark, and not while an application is pending. Also, you may use the registration symbol with the mark only on or in connection with the goods and/or services listed in the federal trademark registration.