The Supreme Court held that claiming priority of an earlier application requires a direct and unambiguous disclosure in the priority document of all features of the technical teaching as defined in the claims. If the claimed invention is characterized by a particular property of one of its components that has not (clearly) been disclosed in the priority document, and that permits a person of ordinary skill to make a deliberate selection out of a range of different embodiments (here: insensitivity to UV light), the priority document lacks a clear and unambiguous disclosure of the invention.

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