TRADEMARKED
trademarked
(adjective) (of goods and merchandise) labeled with proprietary (and legally registered) identification guaranteeing exclusive use; “trademarked goods”
Source: WordNet® 3.1
Adjective
trademarked (not comparable)
Registered as a trademark.
Verb
trademarked
simple past tense and past participle of trademark
Usage notes
Among practitioners of trademark law, it is generally considered incorrect to use "trademark" as a verb; the preferred terminology would be to register a trademark.
Source: Wiktionary
TRADEMARK
Trade"-mark`, n.
Definition: A peculiar distinguishing mark or device affixed by a
manufacturer or a merchant to his goods, the exclusive right of using
which is recognized by law.
Source: Webster’s Unabridged Dictionary 1913 Edition