under federal (and some state) laws known as
dilution statutes, you may go to court to prevent your trademark from being
used by someone else if your mark is famous and the other company’s use would
dilute the mark’s strength — that is, weaken its reputation for quality
(called tarnishment) or render it common through overuse in different contexts
(called weakening). The key element is that your mark is famous — that is,
distinctive and recognizable.
Dilution statutes apply even if there is no way customers would
be likely to confuse the source of the goods or services with those sold by the
owner of the famous mark.