Okla. Stat. tit. 12A, § 1-9-709
Oklahoma Code Comment
Revised section 9-709 speaks to priority. If priority was fixed under old law, it governs. Otherwise, revised Article 9 governs. Section 9-709(b) provides a special rule to determine the priority of an interest that first becomes perfected or enforceable under revised Article 9. To illustrate, suppose in 1999 the first secured party (SP-1) took but did not perfect a security interest in accounts. Revised Article 9 became effective on July 1, 2001. On August 1, 2001, the second secured party (SP-2) perfected a security interest in the accounts. Revised Article 9 governs priority and SP-2 wins. If SP-2's security interest was created instead in 2000 and never was perfected, SP-1 would win under old Article 9. If SP-2 then properly filed on August 1, 2001, however, SP-2 will prevail under revised Article 9.
As another illustration suppose in 1999 SP-1 took a security interest in "instruments" and filed to perfect. In 2000 SP-2 took an interest in "accounts" and filed to perfect. After July 1, 2001, an account debtor evidences an overdue account with a note. SP-l as the earlier perfected interest would prevail, except under prior law his or her filing was not good for instruments and so under revised section 9-709(b) , SP-l's priority stems only from the effective date of revised Article 9 when filing suffices, and thus SP-2 prevails.
See also Oklahoma Comment to revised section 9-702 .