The Supreme Court of Pennsylvania has recently confirmed that the doctrine of estoppel by deed applies to oil and gas leases and does not require detrimental reliance. See Shedden v. Anadarko, No. 103 ...

What happens when a deed is unclear and the parties to a transaction involving oil and gas interests are long deceased? How do the heirs to the parties involved resolve their disputes? This is a ...

Let’s talk the Duhig Rule and estoppel by deed in Texas. Don’t run away yet. We’ll get to the point quickly and then you can leave. Under the doctrine of estoppel by deed: “All parties to a deed are ...

In their Commercial Division Update, George Bundy Smith and Thomas J. Hall write: Several Commercial Division cases make clear that at times a non-existent corporation can be deemed to exist, and thus ...

“’It is time for this court to consider en banc the doctrine of assignor estoppel as it applies both in district court and in the Patent Office’ in order to clarify this ‘odd and seemingly illogical ...

THE concept of separate legal personality of corporations is foundational in corporate law. A company, upon proper incorporation, acquires a juridical personality distinct from its stockholders and ...

“The CAFC explained that the doctrine of assignor estoppel does not bar an assignor from filing a petition for IPR to challenge the validity of the assigned claims, even though such a challenge would ...