Okla. Stat. tit. 12A, § 12A-2-107: Goods to be Severed from Realty: Recording

Goods to be Severed from Realty: Recording. - (1) A contract for

the sale of minerals or the like, including oil and gas, or a

structure or its materials to be removed from realty is a contract

for the sale of goods within this article if they are to be severed

by the seller, but until severance, a purported present sale thereof

which is not effective as a transfer of an interest in land is

effective only as a contract to sell.

(2) A contract for the sale, apart from the land of growing crops

or other things attached to realty and capable of severance without

material harm thereto, but not described in subsection (1) of this

section or of timber to be cut is a contract for the sale of goods

within this article whether the subject matter is to be severed by

the buyer or by the seller even though it forms part of the realty

at the time of contracting, and the parties can by identification

effect a present sale before severance.

(3) The provisions of this section are subject to any third party

rights provided by the law relating to realty records, and the

contract for sale may be executed and recorded as a document

transferring an interest in land and shall then constitute notice to

third parties of the buyer's rights under the contract for sale.