Once a trademark is registered, is it valid forever?

Not automatically forever. Registration with the INPI has an expiration term and then needs to be renewed. If you forget to renew, you can lose the trademark and leave it free for others. The term and the renewal cost can change, so confirm what's currently in effect with your TF inter accountant. For those operating in several countries across the Americas, each registration has its own renewal calendar. TF inter tracks these dates for you, here and in the other countries where your trademark lives.

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