In this suit for patent infringement, plaintiff-appellant American Equipment Corporation (“American”) moved for summary judgment against defendant-appellee Wikomi Manufacturing Company (“Wikomi II”), asserting that a prior consent decree between American and an alleged privy of Wikomi II, which adjudged the patent now in issue both valid and infringed, is res judicata on the instant claim. The district court denied American’s motion but subsequently certified the issue to this court. We agree with American that the degree should be accorded res judicata effect, and accordingly, we reverse.
I.
American, in an action filed on March 8, 1971, in the United States District Court for the Southern District of Illinois, charged that Wikomi Manufacturing Company (“Wikomi I”), a Delaware corporation, infringed U.S. Patent No. 3,231,246, which granted American the exclusive right to manufacture a tractor-mounted concrete mixer. Wikomi I filed an answer, both sides conducted further discovery, and the court conducted a pre-trial conference and set a trial date; however, the suit was terminated through an order and judgment entered by consent on September 13, 1974. The consent judgment provided that the disputed patent was valid and that Wikomi I had infringed the patent by the manufacture and sale of mixers of the type protected. The judgment also included an injunction against future infringement. American contemporaneously concluded a license agreement with Wikomi I.
Three months after entry of the consent judgment, Wikomi I entered into an agreement with Philip Sams to dispose of its mixer business, including the tools, the designs and the technical information used in manufacturing the disputed mixer. One month later, Sams in turn assigned that agreement and related assets to Wikomi II, a Missouri corporation in which Sams owned all the stock. Under Sams’ direction, Wikomi II continued the operation of the mixer business of Wikomi I. Wikomi II retained the general manager, the office manager, and the marketing director of the predecessor company as well as fifteen or twenty line employees. At the time he acquired Wikomi I, Sams was aware of the 1974 consent decree, and his counsel knew about the nature and termination of the prior litigation.
Since the acquisition, Wikomi II has manufactured without alteration the mixer which was the subject of the former suit. However, during this time Wikomi II has neither tendered royalty payments to American as required under the license agreement nor accepted the agreement. As a result, American brought the instant action in the United States District Court for the Central District of Illinois, alleging patent infringement by Wikomi II.
After answer, interrogatories and extensive depositions, American moved for summary judgment, arguing that Wikomi II is barred by the 1974 consent judgment from contesting either validity or infringement of the patent. The district court denied American’s motion, finding in its order that the public interest in finality of judgments was outweighed in the circumstances of this case by the public interest, endorsed by the Supreme Court in Lear v.
Adkins,
*546 II.
In
Lear v. Adkins,
The case before us is quite different from that presented in
Lear.
Here, the issues to which plaintiff wishes to grant res judicata effect are embodied in a formal consent judgment rather than in a private licensing agreement. Such an order entered upon a consent decree represents a judicial act and is generally held to bar a party or its privies from subsequently relitigating the issues settled by the decree.
United States v. Southern Ute Indians,
To give adequate weight to considerations of public policy, courts, in considering its application to patent litigation, have recognized exceptions to an inflexible view of the res judicata doctrine. To protect the public interest in free circulation of ideas, the doctrine of res judicata has been limited to assure that invalid patents are not used or valid patents misused to acquire monopoly power.
Mercoid Corp. v. Mid-Continent Investment Co.,
Courts have agreed that it is unlikely that a party who defends successfully on the issue of infringement will adequately press the issue of invalidity. If the defendant can easily prove that he is not infringing, the hypothetical validity of his opponent’s patent does not concern him. Indeed, a concession of its validity would not prejudice him at all because the patent, even in the absence of such concession, is presumed to be valid. The alleged infringer, therefore, has little incentive to contest a recital of validity.
In contrast, the litigation which results in a concession of validity in a decree which adjudicates both infringement and validity is more likely to be genuine because the defendant who is losing on the issue of infringement must contest validity in order to avoid either the issuance of an injunction which restrains future infringement or the inclusion of a provision for what could amount to substantial liability for past infringement. Thus, the recital of validity in a consent decree which includes a finding of past infringement is less likely to validate invalid patents than the same recital in a decree which does not address the issue of infringement. Comment, Res Judicata Effect of Consent Judgments in Patent Litigation, 18 B.C. Indus. & Com. L.Rev. 66, 95-96 (1976).
Accordingly, courts are reluctant to give res judicata effect to decrees which fail to contain, an adjudication of both validity and infringement because the determination of validity may have depended upon a construction of the patent claim that was sufficiently narrow to avoid a determination of infringement and was at best a hypothetical pronouncement about the existence of infringement.
Prior to
Lear,
we had not hesitated to accord full res judicata effect to consent decrees which addressed both infringement and validity of the disputed patent.
See, e. g., Brunswick Corp. v. Chrysler Corp.,
In so deciding, we join the interpretation of
Lear
adopted by three other Courts of Appeals, by several academic commentators, and most recently by one district court within this circuit.
See Wallace Clark & Co.
v.
Acheson Industries, Inc.,
First, according res judicata effect to consent decrees like the one before us will encourage earlier and more vigorous challenges to the validity of patents. As the Court of Appeals for the Sixth Circuit noted in Schlegel Manufacturing Co. v. USM Corp.,
The public interest requires that an invalid patent be stripped of its monopoly, and at as early a date as possible. When a consent decree is to be given res judicata effect, litigants are encouraged to litigate the issue of validity rather than foreclosing themselves by a consent decree. If they were given a second chance to litigate the issue of validity, alleged infringers might well accept a license under a consent decree and forego an attack on validity until favored by a stronger financial position, or until threatened by other manufacturers who were not paying royalties. By giving res judicata effect to consent decrees this court protects the public interest in that an alleged infringer is deprived of a judicial device which could be used to postpone and delay a final adjudication of validity.
To hold otherwise would permit abuse of the judicial process, waste of judicial re *549 sources and reward' questionable ethical conduct. These are all matters which also concern the public interest. To adopt the plaintiffs position would force every patent validity and infringement suit to a trial on the merits to assure a res judicata effect. It would discourage settlement of such litigation, since otherwise there could be no assurance of finality. Wallace Clark & Co. v. Acheson Industries, Inc.,394 F.Supp. 393 , 400 (S.D.N.Y.1975), aff’d,532 F.2d 846 (2d Cir.), cert. denied,425 U.S. 976 ,96 S.Ct. 2177 ,48 L.Ed.2d 800 (1976).
If encouraging the swift, and decisive removal of artificial barriers to the competition of ideas is the primary policy advocated in Lear, providing opportunities for recurrent, expensive, and duplicative litigation between the same parties is the least effective way to promote such a policy.
Second, under our result, the strong interest in voiding meritless patents will be adequately protected. Granting res judicata effect to consent decrees adjudging both validity and infringement does not close courtroom doors to litigation on the issue of patent validity, except as to parties and their privies after they have had an opportunity to litigate the issues fully. The patent is still subject to challenge by third parties interested in the subject matter of the patent, including other licensees who have not yet aired their own challenge to a patent’s validity. Unlike the more broadly preclusive doctrine of licensee estoppel at issue in Lear, the doctrine of res judicata when applied to consent decrees does not affect third parties.
Third, adoption of the district court’s and Wikomi II’s position would consign us to an
ad hoc
determination of the applicability .of the res judicata doctrine. For example, in the present suit, the court would be forced to consider the motivation of Wikomi I’s chief executive in accepting the consent decree. Wikomi II has argued that the decree should not be read to represent a binding determination of validity and infringement because at the time it was entered the executive was in deteriorating health and was anxious “in any way he possibly could to extricate his company from patent litigation which was hindering his efforts to sell the company. It is possible to imagine an endless .list of such subjective and elusive factors, which under Wikomi II’s argument would have to be evaluated before according res judicata effect to a decree. Included in the list might be the extent to which discovery had advanced in the prior proceedings, the degree of judicial supervision of presettlement negotiations, the remaining life of the patent at the time of the decree, and the size or burden of any royalty payments established by the decree or by a contemporaneous license agreement. This “case-by-case” approach would “leave the parties at the mercy of what inevitably would be an imprecise and uncertain test.”
Warner-Jenkinson Co. v. Allied Chemical Corp.,
For the foregoing reasons, the district court’s order denying summary judgment to plaintiff is
Reversed.
Notes
. On appeal, Wikomi II argues that there is a lack of privity between it and Wikomi I. The district court in its order denying summary judgment did not explicitly address the issue *546 but rather apparently assumed the existence of privity:
The question presented is one purely of law. It is undisputed that the cement mixer manufactured by Wikomi I and the subject of the prior lawsuit, is now being manufactured without substantial change by Wikomi II. The sole question is whether the consent decree entered into by Wikomi I precludes Wikomi II from contesting the validity of the patent held by plaintiff and its infringement under the doctrine of res judicata. American Equipment Corp. v. Wikomi Manufacturing Co., No. S-Civ-76-159 (S.D.Ill. May 26, 1978).
Under the terms of § 1292(b), the factual determination of privity is not before us for decision. Even if it were, however, the record reveals sufficient continuity in property ownership and personnel between Wikomi I and Wikomi II to satisfy the standards set forth in
Schnitger v. Canoga Electronics Corp.,
. After noting that the prior consent decree between the parties did not contain an adjudication of infringement, we stated:
Even if we assume, however, that the consent decree embodied an adjudication of infringement, we do not believe that the Lear rationale would necessarily be inapplicable. To allow the parties to consent to an adjudication of infringement would simply result in the erection of another obstacle to tests of patent validity.502 F.2d at 1369 .
. In noting that we had not yet decided that issue we distinguished
Crane Co. v. Aeroquip Corp.,
Wikomi II also relies on the fact that the district court in
USM v. Standard Pressed Steel Co.,
ruled that res judicata would not bar. a licensee from subsequently contesting the validity of a patent even though the prior consent decree between the parties had declared the patent to be valid and infringed.
Similarly, Wikomi II relies upon the decision in
Butterfield v. Oculus Contact Lens Co.,
. In an abbreviated opinion, the Court of Appeals for the Ninth Circuit has also reached the same result but without discussing
Lear. See Schnitger v. Canoga Electronics Corp.,
