Whether the trademark name unmarked circle R used after the combination of two or three trademarks infringes the rights of the prior trademark depends on the similarity between the combined trademark and the prior trademark. If there is a great similarity with the prior trademark, even if the circle R is not marked, the rights of the prior trademark are infringed. If the obligee investigates, then you will bear the corresponding tort consequences;

If there is no legal similarity between your combined trademark and the prior trademark, the mark R is completely legal even after you apply for registration. You can use it if you don't register, and you can't use it if someone registers in the future.

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