assignor estoppel
Defined in 1 dictionary — Case Law
Definitions from Case Law
From 266 U.S. 342 - Westinghouse Electric Mfg Co v. Formica Insulation Co · 1924Most cited · 440 citing opinions
an assignor of a patent right is estopped to attack the utility, novelty or validity of a patented invention which he has assigned or granted as against any one claiming the right under his assignment or grant