How do I respond to a ‘likelihood of confusion’ with a registered trademark I already own?

You can claim ownership of a prior registration by amending your trademark application. This may overcome the Examiner’s refusal.

Trademark Response: How do you present argument?

Most importantly, be persuasive. There are few rules for the format of the argument. The electronic filing system prompts for most rules.

Can I amend a trademark after rejection?

Probably not. Changes can be made, so long as, the changes do not “materially alter” the mark, which will not be enough to overcome the refusal.