Plаintiff Mary S. Kraly appeals from an order of the district court holding claims 3-6 of patent No. 3,095,342, 1 relating to a specific type of tubeless tire repair insert, invalid and a partial defense to an action for specific performance and damages for breach of an agreement granting defendant National Distillers and Chemical Corporation’s predecessor-in-interest, H. B. Egan Manufacturing Co., a nonexclusive license under the above patent. National Distillers cross-appeals from that aspect of the order holding it liable to Kraly under the licensing agreement for royalties for the fourth quarter of 1969 and the first three quarters of 1970. On appeal, Kraly contends that principles of res judicata bar National Distillers from challenging the validity of the patent because an earlier litigation between Kraly and Egan was dismissed with prejudice when the parties accepted a licensing agreement which provided, inter alia, that Egan would not contest the validity of thе patent. Kraly alternatively argues that the court erred in determining that the claims of the patent in question were invalid. In its cross-appeal, National Distillers asserts that it is not liable to Kraly for royalties under the licensing agreement, even though it continued to stamp Kraly’s patent number on its tire inserts through September 1970, because Kraly obtained the patent through misrepresentation. National Distillers also argues that it is excused from its duty to pay royalties because Kraly breached its licensing agreement by failing to take measures to abate unlicensed sales after receiving adequate notice of such sales from National Distillers. We affirm the order of the district court.
On November 4, 1966, Mary Kraly instituted an action in federal district court against Sears, Roebuck & Co. and H. B. Egan Manufacturing Co., Inc. 2 That suit alleged infringement of the same patent involved in this case, and Egan asserted defenses of invalidity and fraud in his answer. On February 27, 1967, Kraly and Egan entered into an agreement providing that Egan would receive а nonexclusive license from Kraly for production of the patented tire repair insert, that Egan would pay royalties to Kraly on each licensed insert sold, and that Egan would mark each insert with “Licensed under U. S. Patent No. 3,095,-342” or its equivalent. Moreover, the agreement provided that Egan’s obligations would be conditioned on Kraly’s bringing suit for infringement to prevent substantial quantities of unlicensed sales within six months after notice of such sales was given by Egan. Finally, Egan would pay Kraly $8,000 “in full *1368 satisfaction of any and all claims” that Kraly might have against Egan arising from the latter’s “past sales of tire repair inserts,” and would not “contest the validity” of the patent. Thereafter, the court dismissed the action with prejudice (even though the parties had requested that the dismissal be entered without prejudice). The court stated that the parties, by agreement, had made full settlement of all claims for infringement, with Egan taking a license under the Kraly patent.
The parties or their successors complied with the terms of the licensing agreement through each quarter of 1967, 1968, and the first three quarters of 1969. Additionally, Mrs. Kraly received $8,000 from Egan. National Distillers sent Kraly a letter on May 5, 1969, allegedly giving notice of substantial unlicensed sales, and no royalty payments were made subsequent to the third quarter of 1969.
I.
Citing Phillips v. Shannon,
Kraly next asserts that the court erred in extending the rationale of Lear, Inc. v. Adkins,
Kraly argues that this result conflicts with our deсision in Ransburg Electro-Coating Corp. v. Spiller & Spiller, Inc.,
In
Ransburg,
the court was confronted with the issue of the extent to which a prior settlement of an infringement action is enforceable once noninfringement has been established. There, as here, the settlement agreement included both a payment for past infringement and a prospective licensing agreement. With respect to the payment for рast infringement described in the opinion as the “settlement contract,” the court allowed the plaintiff to recover the balance due on the basis that the agreement was “a promise ... to pay liquidated damages for past infringements in return for a dismissal of the infringement suit.”
Although the federal patent policy prevails over ‘the technical requirements of contract doctrine’ ... we believe that such policy must occupy a subsidiary position to the fundamental policy favoring the expedient and orderly settlement of disputes and the fostering of judicial economy. . The vehicle of settlement would be a useless item if contracts such as the one here, were subject to invalidation after they were consummated. We think the federal patent policy should not be carried so far.489 F.2d at 978 .
Furthermore, the court reasoned that a failure to enforce the settlement contract would not effectuate the policy of encouraging early tests of patent validity enunciated in Lear, inasmuch as it would allow the alleged infringer to settle at a time when he had an opportunity to litigate validity secure in the knowledge that the settlement would cost nothing in the event the patent was subsequently declared invalid. Id.
In this case, the defendant has not counterclaimed for a refund of the monies paid for past infringement. The decision in Ransburg does not support Kraly’s position because the policy considerations are expressly grounded on the distinction between “settlement contracts” and licensing agreements. 5
II.
Kraly further contends that the court erred in determining that claims 3-6 of the patent were invalid. Claim 3 relates to the structure and composition of the tire repair insert, while claims 4-6 refer to the method of its application and use to repair a tire while it is mounted on the vehicle. More specifically, Kraly argues respecting claim 3 that the court erred in its application of the obviousnеss test and in its conclusions that there was only one distinction between the prior art and the patent in question and that that distinction was obvious to persons of ordinary skill. We cannot agree, and we find that the court applied pertinent patent law 6 in reaching its amply-supported conclusions.
Claim 3 describes a multi-ply, wafer-type tire repair insert with a base lamination of cured rubber and an overlapping or outer facing lamination of uncured rubber. The claim specifies that the insert is folded prior to insertion into the tire injury, so that the uncured rubber lamination is on the outside. Combined with the outer lamination is a chemical accelerator. A rubber-based adhesive containing a second accelerator is first applied to the tire injury, and when the insert with its own accelerator in the laminated uneured rubber is inserted into the tire, self-vulcanization of the insert to the tire is initiated.
The court found it undisputed that two-ply laminations of cured and uncured rubber were known and used in patching tires from the outside and on thе wheel, and further, that it was known that inserts with an outer layer of uncured *1371 rubber could be activated by a sulfur accelerator and heat to initiate vulcanization. The court then focused on Kraly’s claimed invention: “a combination of a special insert with a special adhesive doubled for insertion, or inserted, into a tire injury for binding to the hole.”
In applying the criteria articulated by the Supreme Court in Graham v. John Deere Co.,
The court concluded that nothing in the prior art precisely duplicated the Kraly patent, in that one accelerator was incorporated in the layer of uncured rubber while the second one was contained in the cement. It then considered whether this combination would have been obvious to a person reasonably knowledgeable or skilled in the art. The court found that neither the chemist from whom Kraly obtained the technical and chemical information regаrding acceleration (and specifically the “self-vulcanizing” cement) nor Kraly’s patent attorney believed that “the inclusion in the vulcanizing cement of a second accelerator to trigger activation of the primary accelerator in the uncured lami-nations” was patentable “simply because it is a feature which at least half a dozen companies are using.” 9 Kraly’s lawyer had, moreover, advised his client that it was his opinion that “no invention is involved in retaining this triggering relationship in two materials long used in tire repairs, when changing to a wafer form one such material whose form had previously been different,” an obvious reference to the round or oval Chambers insert. The court then properly concluded that persons of ordinary skill in the art were well aware of the possibility of the combination and method of accelerating vulcanization found in the Kraly patent and did not consider it patentable. Moreover, such persons found that the shape of the insert resulted in no functional difference in the repair process. 10
In affirming the court’s determination of invalidity, we specifically reject Kraly's contention that Finding No. 46 of the lower court opinion is clearly erroneous. That finding stated that it was *1372 known prior to Kraly’s alleged invention that a flat section of a laminated tire repair material could be folded, inserted folded end first, and then cemented with a suitable adhesive into an injury opening, for the repair of tubeless tires. We note first that Kraly does not challenge, and therefore presumably accepts, the court’s Finding No. 44, in which the court stated more explicitly that the “Chambers insert is applied to repair an injury in the same manner as the Kraly insert, i. e., the protective covering is removed and the insert is folded upon itself before being inserted into the injury opening” (emphasis added). Moreover, we find that the challenged finding is well-supported by the Mix patent, 11 the Pearson book, 12 and the lower court’s judicial notice of his method for reрairing bicycle fees as a boy.
National Distillers’ cross-appeal relates to the court’s awarding of royalties to Kraly for the last quarter of 1969 and the first three quarters of 1970 plus interest. The court keyed the terminal date of National Distillers’ royalty obligation to the date on which National Distillers stopped marking its product with Kraly’s patent number. Anticipating the result reached by this court in Ransburg, the lower court presciently reasoned:
We do not, however, believe that our present finding of invalidity relieves the defendant of its obligatiоn to pay royalties for the period in which it was enjoying the benefit of its license and representing to the public that its product was licensed under the Kraly patent. So long as [the] defendant sought the protection, of the patent, it is only equitable that it should discharge its royalty obligation under the license agreement. Once it ceased to represent that its product was licensed under the patent, it had repudiated the license agreement and assumed the risk of being found liаble for infringing without receiving the concomitant commercial benefit of being a licensee.
While it is true that patent licensees are not estopped from challenging the validity of a licensed patent merely because they have marked their - products with the patent number, Beckman Instruments, Inc. v. Technical Development Corp.,
National Distillers further contends that its obligation to pay royalties was excused by Kraly’s breach of a contractual condition requiring Kraly to bring suit for infringement to bar substantial unlicensed sales when it receives adequate notice from National Distillers. National Distillers argues that its letter of May 5, 1969 provided adequate notice within the meaning of the licensing аgreement, and therefore, that Finding No. 51 is clearly erroneous. We find that the court below properly and fully dealt with this factual question, and we adopt that portion of the court’s opinion which follows:
It is obvious from the undisputed facts that, at the time the letter in question was written, the defendant had not yet ascertained the number of inserts sold per year by the companies named nor had conducted any chemical tests on their products to determine *1373 whether or not they were “unlicensed sales of Licensed Inserts in substantial quantities (which, for the purpose hereof, shall be deemed to be sales from any one source at the rate of 400,000 Licensed Inserts over a period of any one calendar year). . . .”
While the license agreement does not define the investigation which the licensee was to make prior to invoking Section 6.02, it is reasonable to infer that it had an obligation to do more than simply list eight of its competitors in a letter to the licеnsor. It is clear that defendant on May 5, 1969 had no knowledge on which to base its notice under Section 6.02 other than the fact that the companies it named were selling outside-in repair kits. Indeed, on the record before us, there is no evidence that any of the companies utilized a combination of an accelerator in the insert and a second accelerator in the cement to achieve self-vulcanization.
We conclude, therefore, that defendаnt’s letter of May 5, 1969 was not an adequate notice under Section 6.02 of the license agreement.
We have considered National Distillers’ claim that Kraly’s alleged misrepresentation to the U. S. Patent Office precludes any award of royalties. We find that the actions of Kraly’s attorney [not the attorney of record in this appeal] were hardly exemplary and agree with the district court that “[i]t is inconceivable that in any but an ex parte proceeding such a contention [i. e., Kraly’s claim of inventiveness] would have been successful or would even have been urged by an attorney who had previously written to his client that, in his opinion, ‘no invention is involved’ in either the triggering mechanism or the shape.” Nonetheless, we do not find that such conduct amounted to a misrepresentation. We therefore affirm the district court’s award of royalties.
The judgment of the district court is affirmed.
Affirmed.
Notes
. The plaintiff, Mary S. Kraly, is the successor-in-interest to John Kraly, the original patentee of No. 3,095,842, issued on January 25, 1963.
. Mary S. Kraly, Executrix of the Estatе of John Kraly v. Sears, Roebuck & Co. and H. B. Egan Manufacturing Co., Inc., No. 66 C 2016 (N.D.Ill.1967).
. We note that the district court altered the terms of the decree prepared by the attorneys to provide for a stipulated dismissal of the suit with prejudice. The lower court’s action comported with the prevailing pr e-Lear thought that acknowledgment of the validity of a patent through acceptance of a licensing agreement incorporated into a consent decree barred the partiеs or their privies from subsequently challenging the validity of the patent. In the trial transcript, Judge Will states: “This is a case in which acknowledgment of validity of the patent and an agreement not to attack it is part of the consideration for the *1369 disposition of a lawsuit, as well as for a license agreement.” The court continued that while there was no express finding of validity in the decree — in contrast with the acknowledgment of validity embodied in the agreement — this case was distinguishable from Lear, which involved a purely private agreement. The clear implication from the transcript is that in recognizing the agreement as the basis for dismissal, the court by incorporation adjudicated the issue of validity.
. If the parties had requested a dismissal with prejudice, we would have no trouble con-dueling that the $8,000 payment was “a grant of some relief from which infringement can be inferred.” Understanding that a dismissal with prejudice is res judicata as to all issues presented, the parties would clearly have intended the рayment to represent an admission of infringement. Insofar as a stipulated dismissal is interpreted as denoting only what the parties acknowledge, it is unclear what effect the court’s decision to enter the order with prejudice has on conclusions to be drawn with respect to what the agreement acknowledged.
. This court’s opinion in Maxon Premix Burner Co. v. Eclipse Fuel Engineering Co.,
. Kraly additionally cites as error the failure of the court to respond to a motion filed pursuant to rule 52(b) of the Federal Rules of Civil Procedure for a finding as to the presumption of validity accorded to the patent in the case. By its terms, rule 52(b) permits the court to make additional findings at its discretion. As that rule of adjudication was implicit in the court’s resolution of the case, whatever the court’s personal view, it was not an abuse of discretion for the сourt to determine that the requested finding was unnecessary.
. Chambers and Moats Patent No. 2,966,187.
. Gruber Belgian Patent No. 546,957.
. Letter from Ephraim Banning, Esq., to Horace Brose, Kraly’s agent and prospective partner, dated December 13, 1961, quoting in part from a letter sent by Robert A. Flory, Kraly’s chemist, to Brose dated October 9, 1961.
. Kraly does not specify the grounds on which she contests the finding of invalidity respecting claims 4-6. These claims refer to the proper method for applying the tire repair insert. Essentially, the method prescribes that one remove the protective cover from the insert, prestretch it, and then place it in a needle and insert it into the tire injury, which has already been coated with a cement containing the second accelerator. In holding that the prior art as to method of inserting tire repair inserts into a punctured tire in-eluded all the elements described in the three claims, the court stated :
Nothing therein is new. All tire repair from the outside involves the insertion of rubber into the hole or injury with a needle. Thе Court repaired punctures in his bicycle tires more than fifty years ago by this method. Nor is the use of cement in connection therewith novel, or the presti'etching of the insert before insertion. This leaves only the use of an insert containing an accelerator in the cement which we have already discussed.
We conclude as to claims 4, 5 and 6 that the prior art as to the method of insertion of inserts into a punctured tire included all elements described in the three claims and they are, therefore, also invalid.
We concur in these findings and the conclusion of the trial court.
. Mix patent No. 553,562.
. II. Pearson, Pneumatic Tires 1086-1087.
