Section 9-310 - When filing required to perfect security interest or agricultural lien; security interests and agricultural liens to which filing provisions do not apply(a) Except as otherwise provided in subsection (b) and § 9-312(b), a financing statement must be filed to perfect all security interests and agricultural liens.(b) The filing of a financing statement is not necessary to perfect a security interest: (1) That is perfected under § 9-308(d), (e), (f), or (g);(2) That is perfected under § 9-309 when it attaches;(3) In property subject to a statute, regulation, or treaty described in § 9-311(a);(4) In goods in possession of a bailee which is perfected under § 9-312(d)(1) or (2);(5) In certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under § 9-312(e), (f), or (g);(6) In collateral in the secured party's possession under § 9-313;(7) In a certificated security which is perfected by delivery of the security certificate to the secured party under § 9-313;(8) In deposit accounts, electronic chattel paper, electronic documents, investment property, or letter-of-credit rights which is perfected by control under § 9-314;(9) In proceeds which is perfected under § 9-315; or(10) That is perfected under § 9-316.(c) If a secured party assigns a perfected security interest or agricultural lien, a filing under this article is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.