Okla. Stat. tit. 18, § 381.45
Any association or federal association may continue to recognize the authority of an attorney-in-fact authorized in writing to manage or to make withdrawals either in whole or in part from a savings account or savings deposit, whether of a minor or adult, until it receives written notice or is on actual notice of the revocation of his authority. For the purposes of this section, written notice of the death or adjudication of incompetency of such savings account or savings deposit holder shall constitute written notice of revocation of the authority of his attorney.
Laws 1970, HB 1543, c. 101, § 45, emerg. eff. June 1, 1970; Amended by Laws 1978, SB 385, c. 168, § 19, eff. July 1, 1979.