Delaware Code
Part 2. Effectiveness of Security Agreement; Attachment of Security Interest; Rights of Parties to Security Agreement
§ 9-209. Duties of secured party if account debtor has been notified of assignment.

(a) Applicability of section. — Except as otherwise provided in subsection (c), this section applies if:

(1) there is no outstanding secured obligation; and
(2) the secured party is not committed to make advances, incur obligations, or otherwise give value.
(b) Duties of secured party after receiving demand from debtor. — Within 10 days after receiving an authenticated demand by the debtor, a secured party shall send to an account debtor that has received notification of an assignment to the secured party as assignee under Section 9-406(a) an authenticated record that releases the account debtor from any further obligation to the secured party.
(c) Inapplicability to sales. — This section does not apply to an assignment constituting the sale of an account, chattel paper, or payment intangible.