Intellectual Property Law
Intellectual Property Law Questions? Ask a Lawyer
I would not be worried, because the term "self-tape" is merely descriptive of the goods/services and as such would not qualify as a protectable trademark unless this one guy's business is truly associated with that term (which is doubtful) such that it has gained consumer association etc. I suspect that the term cannot be trademarked due to descriptiveness and thus anyone can use it.
Seems like the best approach is to call his bluff and ignore him, or respond by saying that the term is merely descriptive and he does not have TM rights in it. Business have a right to use descriptive terms, they cannot be taken out of the vocabulary by trademarks.
If he was at all serious you will get a C&D letter from an attorney, but I doubt you ever will because he knows he does not have enforceable TM rights
It's the type of trademark that would be invalidated in court once evidence was submitted that its a merely descriptive term in the industry...so if he does not back off I would have a TM attorney write a letter attacking the validity of the TM and indicating that if he pursues legal action you will seek to invalidate the TM