Section 1329.67 - Rights at common lawSections 1329.54 to 1329.67 of the Revised Code do not adversely affect the rights or the enforcement of rights in trademarks or service marks acquired in good faith at common law prior to any of the following times:
(A) Prior to another person's registration in this state of a trademark or service mark, with the registrant having a subsequent first use date;(B) Prior to another person's registration in the United States patent and trademark office of a trademark or service mark, with the other person having a subsequent first use date;(C) Prior to another person's registration in the United States patent and trademark office of a trademark or service mark, with the other person having a subsequent priority date.Effective Date: 9/1/1998 .