Body v. McDonald
In Body v. McDonald, 79 Wyo. 371, 334 P.2d 513 (Wyo. 1959), the grantors held only a three-quarters mineral interest, a one-quarter interest having been previously reserved to a third party.
They transferred the property by a warranty deed that described the entire mineral interest and reserved a one-quarter mineral interest.
The Court held the grantors were estopped from claiming that the grantees received less than three-quarters of the mineral interest even though the grantees had actual notice of the outstanding one-quarter interest.
Although the grantee was aware of the outstanding one-quarter interest, we held that notice is irrelevant as the grantor may warrant title even when he does not own what he is warranting. Id. at 515.