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From Wikipedia:
An unregistered trade mark is a trademark which does not benefit from the protection afforded to trade marks through registration.
In the United States, registration, both federal or state, is not required to obtain rights in a trademark. An unregistered mark may still receive common law trademark rights. Those rights, for example, may extend to its area of influence—usually delineated by geography. As such, multiple parties may simultaneously use a mark throughout the country or even state. An unregistered mark may also be protected under the federal "Lanham Act" (15 USC § 1125) prohibition against commercial misrepresentation of source or origins of goods.
MURT
