At any time before a patent has been granted1 for an invention2, whether or not an application3 has been made for it, any person may refer to the comptroller4 the question whether he is entitled to be granted a patent for that invention5, either alone or with any other persons, or has or would have any right6 in or under any patent so granted or any application for such a patent7. Similarly, at any time before a patent has been granted for an invention, any of two or more
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