Okla. Stat. tit. 21, § 1643

Any director of a corporation or joint stock association, although not present at the meeting of the directors at which any act, proceeding or omission of such directors, in violation of this article, occurs, is deemed to have concurred therein, if the facts constituting such violation appear on the record or minutes of the proceedings of the board of directors, and he remains a director of the same company for six (6) months thereafter, and does not, within that time, cause or in writing require his dissent from such illegality to be entered in the minutes of the directors.