Del. Code tit. 9, § 4648

No bonds or notes shall be made payable on demand, but any bond or note may be made subject to redemption prior to maturity on such notice, at such time or times, with such redemption provisions and at such redemption prices as may be stated in the bond or note. When any such bond or note shall have been validly called for redemption, and any payment of the principal thereof and of the interest thereon accrued to the date of redemption shall have been made or provided for, interest thereon shall cease.