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Assignor Estoppel Does Not Apply to IPRs

Assignor Estoppel Does Not Apply to IPRs

By Jocelyn Yu Ph.D. and Carl Kukkonen Assignor estoppel is a long-established, common-law doctrine of equity, which prevents a party who assigns a patent to another from later challenging the validity of the assigned patent.  The doctrine also applies to parties in...

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ITC Blog: ITC Provides a Way to Work Around IPR Estoppel

ITC Blog: ITC Provides a Way to Work Around IPR Estoppel

By: David Maiorana  In In re Certain Magnetic Tape Cartridges and Components Thereof, 337-TA-1058 (ITC October 2, 2018, Order), Administrative Law Judge Cheney ruled that even if a respondent is estopped from raising certain invalidity challenges because it failed to...

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