What is Registered Trademark?

Legal Definition
the name that is given to a trademark that has been recorded and registered with the relevant government body such as US Patent Office.
Legal Definition
A trademark filed in the United States patent office, with the necessary description and other statements required by the act of congress, and there duly recorded, securing its exclusive use to the person causing it to be registered. Rev. St. U. S. ยง 4937. See U. S. Comp. St 1901, p. 3401.
-- Black's Law Dictionary