Tex. Bus. Orgs. Code § 21.414
(a) A director of a corporation who is present at a meeting of the board of directors at which action has been taken is presumed to have assented to the action taken unless:
(3) the director has sent to the secretary of the corporation, within a reasonable time after the meeting has been adjourned, a written dissent or abstention by:
Acts 2003, 78th Leg., ch. 182, Sec. 1, eff. Jan. 1, 2006.
Acts 2017, 85th Leg., R.S., Ch. 75 (S.B. 1518), Sec. 11, eff. September 1, 2017.