- Nationwide trademark protection (even if your mark is not in use nationwide)
- Use of the ® symbol to put people on notice and denote a certain level of quality
- U.S. Customs will attempt to prevent potentially infringing products from entering the United States
- Constructive notice of ownership of the mark (this means that by virtue of registration, anyone who uses the mark after you is expected to know that it is your trademark, they will be labeled "willful" infringers if they misuse it, and you will be able to collect enhanced damages and attorney fees)
- After five years, if no one contests your right to the mark, you can file for "incontestable status," meaning that no one can ever contest your right to using the mark.
What key advantages are there is registering a trademark with the United States Patent and Trademark Office?