Ohio Revised Code Title XIII. Commercial Transactions § 1343.05

No debtor is deemed a particeps criminis on account of having paid, or agreeing to pay, the exorbitant interest mentioned in section 1343.04 of the Revised Code, but he shall have like remedy and relief in either case. No bona fide indorsee of negotiable paper purchased before due, shall be affected by any usury exacted by any former holder of such paper, unless he has actual notice of the usury previous to his purchase. In such cases, the amount of such excess, if incorporated into negotiable paper, after payment, may be recovered back, by action against the party who originally exacted the usury.