Ohio Rev. Code § 323.03: Certificates to be dated.

Each certificate furnished as provided in sections 323.02 to 323.05, inclusive, of the Revised Code, shall be dated and used by the taxpayer for the payment of taxes as provided by such sections within six months from its date; otherwise it shall be void for the payment of taxes. This shall in no manner impair the validity of the claim on which the certificate is based. Such certificates shall only be used for the payment of taxes on the 1933 and subsequent duplicates, including delinquencies.