35 U.S.C. § 4745

“Except as otherwise expressly prohibited by law or otherwise provided in this subtitle, an official to whom functions are transferred under this subtitle (including the head of any office to which functions are transferred under this subtitle) may delegate any of the functions so transferred to such officers and employees of the office of the official as the official may designate, and may authorize successive redelegations of such functions as may be necessary or appropriate. No delegation of functions under this section or under any other provision of this subtitle shall relieve the official to whom a function is transferred under this subtitle of responsibility for the administration of the function.