Tex. Business Organizations Code § 5.251: FAILURE TO DESIGNATE REGISTERED AGENT.

The secretary of state is an agent of an entity for purposes of service of process, notice, or demand on the entity if:

(1) the entity is a filing entity or a foreign filing entity and:

(A) the entity fails to appoint or does not maintain a registered agent in this state; or

(B) the registered agent of the entity cannot with reasonable diligence be found at the registered office of the entity; or

(2) the entity is a foreign filing entity and:

(A) the entity's registration to do business under this code is revoked; or

(B) the entity transacts business in this state without being registered as required by Chapter 9.

Acts 2003, 78th Leg., ch. 182, Sec. 1, eff. Jan. 1, 2006.