OPINION
This appeal is taken from an order in an ancillary discovery proceeding commenced to enforce a subpoena that issued from the Eastern District of Virginia in connection with an underlying action filed in the Northern District of Illinois. Because jurisdiction in the underlying action is based in part on 28 U.S.C. § 1338, which confers jurisdiction upon district courts in patent matters, we conclude that any review of this ancillary discovery ruling must be sought from the United States Court of Appeals for the Federal Circuit under 28 U.S.C. §§ 1292(c) and 1295(a). Rather than dismissing this appeal, however, we invoke 28 U.S.C. § 1631 to transfer it to the Federal Circuit, despite any uncertainty that might exist as to the appealability of this type of discovery order, based on the fact that the Federal Circuit will ultimately have jurisdiction to review the merits of the underlying action.
I
McCook Metals L.L.C. (“McCook”) commenced an action against Alcoa, Inc., a competitor of McCook in the manufacture and sale of commercial aircraft wing components, in the Northern District of Illinois. In that action, McCook alleged that Alcoa interfered with McCook’s customer contracts and prospective business advantage in violation of state law, that Alcoa *333 monopolized the relevant product market in violation of the Sherman Act, and that two of Alcoa’s patents for making high strength aluminum alloy — nos. 4,828,681 and 4,954,188 — were neither valid nor enforceable. McCook invoked the district court’s subject matter jurisdiction based on the patent and antitrust claims.
In connection with this underlying litigation, McCook served a third-party subpoena, issuing from the Eastern District of Virginia, on Reynolds Metals Company to appear, testify, and produce documents at a deposition scheduled in Richmond, Virginia. When Reynolds Metals refused to answer particular questions and produce particular documents, giving as its reasons the work product doctrine and attorney-client privilege, McCook filed a motion in the Eastern District of Virginia to enforce its subpoena. The district court upheld Reynolds Metals’ position and denied McCook’s motion, and McCook took this appeal from the district court’s order. Shortly before oral argument before us, Reynolds Metals filed a motion to transfer this case to the Court of Appeals for the Federal Circuit on jurisdictional grounds.
II
In its motion to transfer, which was made under 28 U.S.C. § 1631, Reynolds Metals asserted that, because the validity of two Alcoa patents is at issue in the underlying action and subject matter jurisdiction in that action is premised in part on 28 U.S.C. § 1338, the Court of Appeals for the Federal Circuit has exclusive jurisdiction over appeals of decisions in ancillary discovery proceedings. Reynolds Metals represented in its motion that “McCook agrees with this analysis,” a position McCook confirmed at oral argument. McCook nonetheless requested that we proceed to decide the discovery issues on the merits because they have been briefed and argued before us. We agree with Reynolds Metals, however, that this court “must be sure of its own jurisdiction before getting to the merits.”
Ortiz v. Fibreboard Corp.,
We begin our analysis by noting that, while most appeals must be filed in the court of appeals for the circuit in which the district court is located,
see
28 U.S.C. § 1294, only the Federal Circuit can hear an appeal when the district court’s jurisdiction was based “in whole or in part” on 28 U.S.C. § 1338, which confers original jurisdiction over patent-related claims on district courts,
id.
§ 1295(a)(1). Similarly, interlocutory orders in cases in which jurisdiction is based on § 1338 are reviewed exclusively by the Federal Circuit.
See id.
§ 1292(c). Congress created this dual-appellate structure in 1981 to promote “nationwide uniformity in patent law.”
Bonito Boats, Inc. v. Thunder Craft Boats, Inc.,
Because the parties in this case agree that the jurisdiction of the District Court for the Northern District of Illinois was predicated in part upon 28 U.S.C. § 1338, as McCook’s complaint sought a declaratory judgment of its rights vis-a-vis Alcoa under the federal patent law, 35 U.S.C. § 1
et seq.,
any appeal from the final judgment in the Northern District of Illinois must go to the Federal Circuit. Because subject matter jurisdiction in the underlying action is based in part on 28
*334
U.S.C. § 1338, so too must the jurisdiction supporting the ancillary proceeding commenced in the Eastern District of Virginia be based in part on § 1338. Although it is true that the ancillary court’s first-layer authority derives from Federal Rules of Civil Procedure 37(a)(1) and 45, which assign to it the responsibility of issuing and enforcing subpoenas in its district, Rules 37 and 45 do not confer subject matter jurisdiction upon the courts. Rather, an ancillary court’s power to issue and enforce subpoenas is entirely dependent upon the jurisdiction of the court in which the underlying action is pending.
See United States Catholic Conference v. Abortion Rights Mobilization, Inc.,
Ill
Our determination that we do not have appellate jurisdiction, however, does not lead inexorably to the conclusion that we must dismiss this appeal. Section 1631 of Title 28 authorizes us to transfer it to the Federal Circuit if (1) to do so would be “in the interest of justice” and (2) the appeal “could have been brought” in the Federal Circuit when it was initially filed in our court.
The first prong of this test is readily met. McCook’s erroneous filing of an appeal in the wrong circuit is “just the type of good faith mistake that Congress intended 28 U.S.C. § 1631 to remedy.”
Kopp v. Dir., Office of Worker’s Comp. Programs,
It is less obvious, however, that McCook’s appeal “could have been brought” in the Federal Circuit at the time when it was filed or noticed in our court. 28 U.S.C. § 1631. Appellate review is as a general matter limited by 28 U.S.C. § 1291 to final orders — those that “end[ ] the litigation on the merits and leave nothing for the court to do but execute the judgment.”
Catlin v. United States,
324 U.S.
*335
229, 233,
Nevertheless, federal courts have long recognized that some collateral orders warrant “review even where they do not conclude the litigation in question.”
MDK Inc.,
Because unreviewability by the court of appeals having appellate jurisdiction over the final judgment in the underlying case is critical to the determination that an ancillary discovery order is “final,” most circuit courts have held that an ancillary discovery order is not “final” when it is entered by a district court within the
same
circuit as the court in which the underlying litigation is pending.
See Periodical Publishers Serv. Bureau, Inc. v. Keys,
The case before us presents a peculiar twist because for patent matters, Congress created one national court of appeals to review all the district courts — the Court of Appeals for the Federal Circuit — and thus one district court’s ancillary discovery ruling in a patent case is appealed to the same circuit as is another district court’s ruling on the merits in the same case, even when the district courts are located in different regional circuits. Because in patent cases the Federal Circuit reviews both the final judgment on the merits and rulings on discovery, under the majority rule — that discovery orders reviewable in the same court of appeals that reviews the final judgment are not “final” — we could *336 not transfer the case to the Federal Circuit because the appeal of the discovery order could not have been brought there at this time. See 28 U.S.C. § 1631.
But the Federal Circuit has not always followed the majority rule in this context and has entertained on more than one occasion interlocutory appeals from ancillary orders denying discovery in patent cases.
See Micro Motion, Inc. v. Kane Steel Co.,
Accordingly, for the reasons given, Reynolds Metals’ motion to transfer this case to the Federal Circuit is granted.
IT IS SO ORDERED.
