The issue in this mineral lease assignment sold through a clearinghouse is whether the Neuhoffs conveyed an overriding-royalty interest in a wellbore only or in the entire lease surrounding the well.

The principal issue in this dispute over Yowell's overriding royalty-interest claim is whether the rule against a contingent property interest existing forever - the rule against perpetuities - bars Yowell's claim for unpaid royalties. A subsidiary issue is whether the rule applies when a corporation conveys the contingent interest.

A principal issue is whether a gas lease term assignment's retained-acreage clause required 320 acres be held back for each well subject to the lease.