Ohio Rev. Code § 1701.42
Notice of the time, place, if any, and purposes of any meeting of shareholders or directors, as the case may be, whether required by law, the articles, the regulations, or (in the case of directors) the bylaws, may be waived in writing, either before or after the holding of such meeting, by any shareholder, or by any director, which writing shall be filed with or entered upon the records of the meeting. The attendance of any shareholder or any director at any such meeting without protesting, prior to or at the commencement of the meeting, the lack of proper notice shall be deemed to be a waiver by the shareholder or director of notice of such meeting. A telegram, cablegram, electronic mail, or an electronic or other transmission capable of authentication that appears to have been sent by a person described in this section and that contains a waiver by that person is a writing for the purposes of this section.
R.C. §1701.42