Okla. Stat. tit. 12, § 12-171.1: Effect of affidavit of service

No judgment rendered more than ten (10) years prior hereto

against unknown heirs, executors, administrators, devisees, trustees

or assigns of any deceased person or, in the alternative, against a

person or his unknown heirs, executors, administrators, devisees and

assigns, shall ever be construed or held to be either void or

voidable on the ground of the alleged insufficiency of said

affidavit, provided the requirements of 12 O.S. 1961, § 171, are met

in such affidavit, either directly or by inference. All such

judgments, if not otherwise defective, are hereby declared valid and

legally effective and conclusive as of the date thereof. Provided,

that nothing in this act shall be construed to affect any litigation

now pending in any courts of the State of Oklahoma on the effective

date of this act.