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When a Trademark is Not a Trademark

By Zak Muscovitch. It happens. A lawyer sends a C&D letter, or serves a UDRP that relies on a "Registered Trademark". It shows up in the USPTO database, but it may not really be a trademark. How is that possible? When the "trademark" is registered on the "Supplemental Register". The United States Trademark Act provides for the registration of trademarks on either the "Principal" or "
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