Quote:
Originally Posted by Barry-xlovecam
 Saw that one coming ... If the trademark is uncontested and granted ... Then you may have an infringement case registered v. common law trademark, that can be tricky ...
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Do you mean against same name with different domain extensions or what? Usually domain extension doesn't make identifiable trademark, so common law trademarks usually get into account when registering. They know how to google at the trademark office.
If you meant that instead of the .com you take other extension because the other one is taken, that can of course lead into problems. But it doesn't have to be .com, it can be .so too, or whatever is the domain for Somalia. And it doesn't need to be registered trademark to be problem, it could be common vs common too.
But this all requires that you are exactly enough on the same business and operate in same areas.
However, the extension might not be identifying factor when registering trademark, but it can be it later (more or less), as there are different criterias used when these things are fought in court.