Estoppel by deed does not require reliance
The Pennsylvania Supreme Court has reaffirmed and applied the doctrine of estoppel by deed in the case of Shedden v. Anadarko E. & P. Co., L.P, 136 A.3d 485 (Pa. 2016) and distinguished it from the doctrine of equitable estoppel. Equitable estoppel “recognizes that an informal promise implied by one’s words, deeds or representations which leads another to rely justifiably thereon to his own injury or detriment, may be enforced in equity” while “[i]n contrast, the doctrine of estoppel by deed precludes one who conveys an interest in land that he does not own, but subsequently acquires the title thereto, from denying the validity of the first conveyance.” In this case, an owner leased oil and gas rights to a 62-acre parcel while actually owning only 50% of them. When the owner later acquired the other 50% of the oil and gas rights, the doctrine of estoppel by deed folded those …