Okla. Stat. tit. 62 § 57.57
The bonds and interest coupons attached thereto shall be delivered to the State Treasurer upon payment of par and accrued interest to the date of delivery thereof. The proceeds of the sale of said bonds shall be deposited in the State Treasury of the State of Oklahoma, in a fund which is hereby created and designated the "1965 Building Bond Fund", where they shall remain subject to disposition to be provided for by the Legislature of Oklahoma, provided that the State Treasurer of the State of Oklahoma, when so directed by the Oklahoma State Regents for Higher Education acting on behalf of the governing board, as to the amounts available for investment shall invest said designated amounts of the 1965 Building Bond Fund in direct obligations of the United States of America or in certificates of deposits from banks in the State of Oklahoma acceptable as depositories by the State Treasurer when such certificates of deposits are secured by acceptable collateral and yield as much or more than direct obligations of the United States of America, and provided further that, all such investments of said monies must be so made that the same shall mature in time to enable the State of Oklahoma to issue warrants for payment of the valid indebtedness incurred for the purpose for which said bonds are issued, when the said indebtedness has been incurred pursuant to legislative authority. It shall be the duty of the Oklahoma State Regents for Higher Education to promptly certify to the State Treasurer the amount of all sums not needed for payment of construction and other legal expenditures payable from the 1965 Building Bond Fund to meet the construction payment schedule, and upon receipt of such certification the State Treasurer shall forthwith make the afore-mentioned investment. All interest received by the State Treasurer upon the above-mentioned securities shall be deposited in the said sinking fund.
Okla. Stat. tit. 62, § 57.57