Okla. Stat. tit. 42, § 42-112: Filing statement of lien in office of county clerk - Right

to lien as against purchaser.

Any person entitled to a lien under this act shall, within

thirty (30) days after the threshing or combining is completed, file

in the office of the county clerk of the county in which the grain

or seed was grown, or threshing or combining done, a statement in

writing, verified by oath, showing the amount, quantity and kind of

grain or seed threshed or combined, the price agreed upon for the

threshing or combining the same, the name of the person for whom the

threshing or combining was done, and a description of the land on

which the grain or seed was grown or threshing or combining done;

unless the person entitled to the lien shall file such statement

within the time aforesaid, he shall be deemed to have waived his

rights thereto; provided, that the lien provided for in this act

shall not attach to any seed or grain after it has been purchased by

a grain dealer and has passed into his possession unless the lien

shall have been filed with the county clerk of the county before the

seed or grain was purchased by such dealer, or he shall have

received written notice from the party entitled to the lien, of his

intention to file the same.