Assignor Estoppel

News & Analysis as of

An Unforeseen Obstacle: Consultants Can Prevent Validity Challenges Through the Use of the Assignor Estoppel Doctrine

Imagine hiring a consultant who designs a process, only to find that the process infringes a patent invented by the same consultant owned by someone else. How much worse would it be if your use of that consultant prevented...more

No Assignor Estoppel in AIA Inter Partes Review

The popularity of IPR proceedings will likely increase as assignor estoppel does not apply to IPRs. Inter Partes Review (IPR) proceedings have become a very popular method of challenging patent validity for actual and...more

IP Update, Vol. 16, No. 2, -- February 2013

In This Issue: Patents - Supreme Court: State Court Has Jurisdiction over a Legal Malpractice Claim; Nothing Non-Obvious About Applying Pre-Existing Technology to the Internet; The Federal Circuit Is Not the...more

Patent Watch: Semiconductor Energy Lab. Co. v. Nagata

"[Neither the Declaratory Judgment Act nor Federal Circuit jurisprudence creates] a federal cause of action for assignor estoppel." On February 11, 2013, in Semiconductor Energy Lab. Co. v. Nagata, the U.S. Court of...more

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