Tex. Bus. & Com. Code § 16.061
(b) An assignment must be made by a properly executed written instrument and may be recorded with the secretary of state by:
(d) The assignment of a mark registered under this chapter is void against a purchaser who purchases the mark for valuable consideration after the assignment is made and without notice of it unless the assignment is recorded by the secretary of state:
(e) An acknowledgment is prima facie evidence of the execution of an assignment, and when recorded by the secretary of state, the record is prima facie evidence of execution.
Acts 2011, 82nd Leg., R.S., Ch. 563 (H.B. 3141), Sec. 1, eff. September 1, 2012.