Importer means anyone who imports a chemical substance, including a chemical substance as part of a mixture or article, into the customs territory of the United States. Importer includes the person primarily liable for the payment of any duties on the merchandise or an authorized agent acting on his or her behalf. The term includes as appropriate:
(1) The consignee.
(2) The importer of record.
(3) The actual owner if an actual owner's declaration and superseding bond has been filed in accordance with 19 CFR 141.20.
(4) The transferee, if the right to withdraw merchandise in a bonded warehouse has been transferred in accordance with subpart C of 19 CFR part 144.