Wyo. Stat. § 9-4-809

As used in W.S. 9-4-809 through 9-4-812 and 9-4-817 "time deposit, open account" means a deposit, other than a "time certificate of deposit" or a "savings deposit", with respect to which "time deposit, open account" there is in force a written contract between the depositor and the depository bank or credit union that neither the whole or any part of the deposit may be withdrawn by the depositor, by check or otherwise, prior to the date of maturity or returned to the depositor by the depository, prior to the date of maturity, without written notice given not less than forty-five (45) days in advance of withdrawals or returns.