Okla. Stat. tit. 12, app 1 R. 1.50
Any interlocutory order not appealable by right under the statutes, which order affects a substantial part of the merits of the controversy, may be brought for review to this Court in compliance with the rules in this Part when the trial judge or the judge's successor has certified that an immediate appeal from that order may materially advance the ultimate termination of the litigation. In the exercise of its statutory discretion this Court may refuse to review a certified interlocutory order. 12 O.S. § 952, Subdiv. (b)(3).
No certified interlocutory order shall be considered if taken from an order overruling a motion for summary judgment. See Rule 1.40 for the application of other rules to review of a certified interlocutory order.
Okla. Stat. tit. 12, app 1 R. 1.50