Ohio App. R. 17
A brief of an amicus curiae may be filed only if accompanied by written consent of all parties, or by leave of court granted on motion or at the request of the court. The brief may be conditionally filed with the motion for leave. A motion for leave shall identify the interest of the applicant and shall state the reasons why a brief of an amicus curiae is desirable. Unless all parties otherwise consent, any amicus curiae shall file its brief within the time allowed the party whose position as to affirmance or reversal the amicus brief will support unless the court for cause shown shall grant leave for later filing, in which event it shall specify within what period an opposing party may answer. A motion of an amicus curiae to participate in the oral argument will be granted only for extraordinary reasons.
Ohio. App. R. 17