Trademarks are very complicated to say the least
Something else to consider with Trade Marks is how the domain is being used, for example:
If you search the term
Inca on
http://www.uspto.gov you will see there are
multiple trademarks for the same term held by
different people using it for
different things so how you use it must have alot of weight when it comes to disputes IMO
some examples are:
Word Mark INCA - owned by INCA CORPORATION FRANCE 20 rue Drouot 75009 PARIS FRANCE
Goods and Services IC 009. US 021 023 026 036 038. G & S: SOUND RECORDING CARRIERS, NAMELY, DISCS, COMPACT DISKS, LASER DISKS, AUDIO CASSETTES, DIGITAL VERSATILE DISKS, NUMERICAL DISKS, AND MINI-DISKS; PRE-RECORDED FILMS, DISKS, COMPACT DISKS, LASER DISKS, AUDIO CASSETTES, DIGITAL VERSATILE DISKS, NUMERICAL DISKS, MINI-DISKS, ALL FEATURING POPULAR MUSIC EXCLUDING ANDEAN MUSIC AND DANCE
.................................................................
Word Mark INCA - owned by Infineon Technologies AG CORPORATION FED REP GERMANY
Goods and Services IC 009. US 021 023 026 036 038. G & S: Electronic components; namely integrated circuits for digital telephones. FIRST USE: 20010228. FIRST USE IN COMMERCE: 20010228
................................................................
Word Mark INCA - owned by Vocel CORPORATION DELAWARE
Goods and Services IC 009. US 021 023 026 036 038. G & S: communications software for wireless mobile devices. FIRST USE: 20060100. FIRST USE IN COMMERCE: 20060100
..................................................................
Word Mark INCA - owned by ACH Food Companies, Inc.
Goods and Services IC 029. US 046. G & S: shortening and edible oils
..................................................................
....and loads more TMarks for
the same word
Obviously it would not be possible to do this with something like Google, Yahoo etc.
.