(a) Whenever a bank account shall, by entries made on the books of the depositor and the bank at the time of the deposit, be created exclusively for the purpose of paying dividends, interest or interest coupons, salaries, wages, or pensions or other benefits to employees, and the depositor at the time of opening such account does not expressly otherwise declare, the depositor shall be deemed a trustee of such account for the creditors to be paid therefrom, subject to such power of revocation as the depositor may have reserved by agreement with the bank.
(b) If any beneficiary for whom such a trust is created does not present his claim to the bank for payment within one year after it is due, the depositor who created such trust may revoke it as to such creditor.