A patent is invalid, as against a person with good title, for a limited period after grant, if the grantee or one of the grantees was not a person entitled to be granted that patent1. The function of this provision is to enable cases of misappropriation of inventions or parts of inventions to be resolved; it is not appropriate to the resolution of mere disputes over ownership2. The issue of validity may be raised on the ground of disentitlement only by a person found by the court or the comptroller in an action for a declaration or on a
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