35 USC 1 - Establishment

(a) Establishment.— 
The United States Patent and Trademark Office is established as an agency of the United States, within the Department of Commerce. In carrying out its functions, the United States Patent and Trademark Office shall be subject to the policy direction of the Secretary of Commerce, but otherwise shall retain responsibility for decisions regarding the management and administration of its operations and shall exercise independent control of its budget allocations and expenditures, personnel decisions and processes, procurements, and other administrative and management functions in accordance with this title and applicable provisions of law. Those operations designed to grant and issue patents and those operations which are designed to facilitate the registration of trademarks shall be treated as separate operating units within the Office.
(b) Offices.— 
The United States Patent and Trademark Office shall maintain its principal office in the metropolitan Washington, D.C., area, for the service of process and papers and for the purpose of carrying out its functions. The United States Patent and Trademark Office shall be deemed, for purposes of venue in civil actions, to be a resident of the district in which its principal office is located, except where jurisdiction is otherwise provided by law. The United States Patent and Trademark Office may establish satellite offices in such other places in the United States as it considers necessary and appropriate in the conduct of its business.
(c) Reference.— 
For purposes of this title, the United States Patent and Trademark Office shall also be referred to as the Office and the Patent and Trademark Office.