Example 3: On October 1, A acquires a temporarily perfected (20-day) security interest, unfiled, in a negotiable document in the debtor's possession under Section 9-312(e) [Maine cite section 9-1312, subsection (5)]. On October 5, B files and thereby perfects a security interest that previously had attached to the same document. On October 10, A files. A has priority, even after the 20-day period expires, regardless of whether A knows of B's security interest when A files. A was the first to perfect and maintained continuous perfection or filing since the start of the 20-day period. However, the perfection of A's security interest extends only "to the extent it arises for new value given." To the extent A's security interest secures advances made by A beyond the 20-day period, its security interest would be subordinate to B's, inasmuch as B was the first to file.

In general, the rule in subsection (a)(1) [Maine cite subsection (1), paragraph (a)] does not distinguish among various advances made by a secured party. The priority of every advance dates from the earlier of filing or perfection. However, in rare instances, the priority of an advance dates from the time the advance is made. See Example 3 and Section 9-323 [Maine cite section 9-1323].

5. Priority in After-acquired Property. The application of the priority rules to afteracquired property must be considered separately for each item of collateral. Priority does not depend only on time of perfection but may also be based on priority in filing before perfection.

Example 4: On February 1, A makes advances to Debtor under a security agreement covering "all Debtor's machinery, both existing and after-acquired." A promptly files a financing statement. On April 1, B takes a security interest in all Debtor's machinery, existing and after-acquired, to secure an outstanding loan. The following day, B files a financing statement. On May 1, Debtor acquires a new machine. When Debtor