FWIW neither is a US company; TSMC is Taiwanese and Samsung is Korean. I have no idea how that plays out in patent-land, but patents are per-country. E.g., "U.

FWIW neither is a US company; TSMC is Taiwanese and Samsung is Korean. I have no idea how that plays out in patent-land, but patents are per-country. E.g., "U.S. Patent #123"