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Also not a lawyer, but I think that's trademark which must be vigorously defended. I believe patents have a six-year limit from infringement: https://www.law.cornell.edu/uscode/text/35/286

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There is a six-year statute of limitations on patent infringement claims. But there is a separate doctrine called "laches" that says that, notwithstanding any statute of limitations, if a plaintiff sits around on their rights, their lawsuit can be barred.

But the Supreme Court recently held that laches was not a defense in statute of limitations cases. So, that wouldn't be an issue here.

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