Fiskars OY AB and Fiskars, Inc. (collectively “Fiskars”) are the owner and exclusive licensee, respectively, of U.S. Patent No. 5,322,001, which is directed to a paper trimmer with a rotary blade. Fiskars filed suit against Hunt Manufacturing Co. (“Hunt”) in the United States District Court for the Western District of Wisconsin, alleging that Hunt’s Heavy Duty 12" Paper Trimmer infringed the Fiskars patent. A jury found Hunt liable for infringement under the doctrine of equivalents and awarded Fiskars more than $3 million in lost profits damages. Twenty-one months after the district court entered judgment, Hunt filed a motion for relief from judgment pursuant to Fed.R.Civ.P. 60(b)(5) or (6), seeking vacatur of the damages award. Hunt appeals the district court’s denial of that motion. Because the district court did not abuse its discretion in denying Hunt’s motion, we affirm.
BACKGROUND
After the trial court granted Hunt’s motion for partial summary judgment that Hunt did not literally infringe the Fiskars patent, the issues of infringement under the doctrine of equivalents and damages were tried to a jury. The jury found that Hunt infringed several claims of the Fis-kars patent under the doctrine of equivalents and awarded Fiskars more than $3 million in damages, including lost profits, lost profits due to price erosion, and projected lost profits resulting from future price erosion.
At trial, Fiskars asserted entitlement to lost profits on the theory that “but for” Hunt’s infringement, Fiskars would have made additional sales of its own product, allegedly an' embodiment of the claimed invention, and would have been able to charge higher prices during the period of infringement and in the future. 1 Hunt *1380 attempted to rebut Fiskars’ lost profits theory by arguing that several third-party paper trimmers on the market, both rotary and guillotine trimmers, were acceptable non-infringing alternatives to Fiskars’ product. 2 Hunt’s evidence consisted primarily of expert opinion testimony that other paper trimmers were acceptable substitutes to consumers although they did not include certain features of the claimed invention. Hunt presented no sales figures or other data that might illustrate market behavior or customer demand and thereby support the opinions of Hunt’s damages experts.
On post-trial motions, the trial court sustained the infringement verdict and the damages award. We affirmed the judgment of the trial court in all respects.
Fiskars, Inc. v. Hunt Mfg. Co.,
Upon receipt of the infringement verdict, Hunt discontinued sales of the infringing trimmer and began selling instead a new rotary trimmer. Hunt alleges, and Fiskars has not disputed, that its new trimmer does not infringe, either literally or under the doctrine of equivalents, because it lacks a means for biasing the cutting blade to an inoperative position, a limitation in Fiskars’ patent claims. According to Hunt, the new non-infringing rotary trimmer was designed “shortly before the trial” and was “available for shipping by the trial date.” Nevertheless, Hunt did not disclose at trial that it had developed a new, non-infringing product.
On May 1, 2000, twenty-one months after entry of the trial court’s judgment, and while Hunt’s appeal to this court was pending, Hunt filed a motion for relief from judgment under Fed.R.Civ.P. 60(b)(5), which provides relief when “it is no longer equitable that the judgment should have prospective application,” or Fed.R.Civ.P. 60(b)(6), a catchall provision providing that a final judgment may be set aside “for any other reason justifying relief from the operation of the judgment.” Hunt sought vacatur of the damages award, contending that Fiskars was not entitled to lost profits damages because post-judgment sales data established that Hunt’s new trimmer was a non-infringing alternative that was acceptable to consumers. Hunt argued that in accordance with this court’s decision in
Grain Processing Corp. v. American Maize-Products Co.,
Hunt appeals the denial of its motion with respect to Rule 60(b)(6) only. We have jurisdiction pursuant to 28 U.S.C. § 1295(a)(1).
*1381 DISCUSSION
I.
The first issue raised by the parties is whether we should apply Federal Circuit law or the law of the regional circuit in which the district court sits, here the Seventh Circuit, in our review of the district court’s denial of Hunt’s Rule 60(b)(6) motion. When reviewing non-patent issues, our general practice is to apply the law of the regional circuit.
Midwest Indus., Inc. v. Karavan Trailers, Inc.,
Nevertheless, a procedural issue that is itself not a substantive patent law issue may be governed by Federal Circuit law if the issue “pertain[s] to patent law, ... bears an essential relationship to matters committed to our exclusive control by statute, ... or clearly implicates the jurisprudential responsibilities of this court in a field within its exclusive jurisdiction.”
Midwest Indus.,
We agree with Hunt that Federal Circuit law should govern our review of the district court’s denial of Hunt’s Rule 60(b)(6) motion seeking relief under the
Panduit
factors. In
Broyhill,
we resolved as a matter of Federal Circuit law the issue whether a consent judgment enjoining infringement of a patent should be set aside pursuant to Rule 60(b) following a judicial determination in another proceeding that the patent was procured through inequitable conduct.
Id.
As in
Broyhill,
the issue before us — whether a lost profits damages award should be set aside because post-trial sales data may show the acceptability of a non-infringing alternative product — turns on a substantive area of patent law. Because resolution of this issue necessarily requires an understanding of the distinctive characteristics of patent damages law, we apply Federal Circuit law in our review. As we have not previously had occasion to consider Rule 60(b)(6) as a matter of Federal Circuit law, however, we may look to the law of other circuits, including the Seventh Circuit, that have reviewed Rule 60(b)(6) rulings.
See Broyhill,
II.
We review the district court’s denial of a Rule 60(b) motion to determine if
*1382
the court abused its discretion.
Id.
at 1083,
Rule 60(b) sets forth six grounds for relief from judgment. Under subsection (6), a catchall provision, relief is available for “any other reason justifying relief from the operation of the judgment,” and only when the motion is “made within a reasonable time.” Rule 60(b)(6) is available only in extraordinary circumstances and only when the basis for relief does not fall within any of the other subsections of Rule 60(b).
Marquip,
Hunt requests relief under Rule 60(b)(6) on the basis of new evidence allegedly showing that Fiskars is not entitled to lost profits. Hunt’s motion relies on our decision in
Grain Processing,
in which we explained that a product or process may qualify as an acceptable non-infringing substitute for purposes of defeating a lost profits claim although it was not “on the market” or “for sale” during the period of infringement.
In its Rule 60(b)(6) motion, Hunt now claims that it had developed an acceptable non-infringing alternative trimmer that was available during the period of infringement, although the new trimmer was not on the market and its existence was not disclosed at trial. Hunt contends that it could not have introduced evidence of its new trimmer at trial because proof that the new trimmer was acceptable to consumers was not available until the new trimmer had been on the market for some time. Only after it obtained sales data, Hunt argues, was it able to demonstrate the acceptability of the non-infringing trimmer.
We are not persuaded by Hunt’s argument. While sales data showing market acceptance of a non-infringing alternative may provide significant evidence that the alternative was acceptable to consumers, such evidence is not the sole means for demonstrating acceptability. Accused infringers routinely rely on witness testimony to show that a non-infringing alternative is acceptable because customers do not seek the patented features absent from the substitute product.
See Gargoyles,
*1383
Inc. v. United States,
It is true that in many cases it may be difficult to prove acceptability of a non-infringing alternative without sales figures illustrating market behavior. Nevertheless, we reject Hunt’s contention that a damages award of lost profits should be reopened after trial if market data probative of acceptability becomes available once a non-infringing alternative replaces the infringing product in the marketplace. In making a case for lost profits, a patent owner need only show a reasonable probability that it would have made additional profits “but for” the infringement.
Grain Processing,
In view of the hypothetical nature of the damages determination, we agree with the district court that the fact that evidence arising nearly two years after trial may have cast some doubt on the accuracy of the trial evidence does not create the extraordinary circumstances necessary to invoke Rule 60(b)(6). Hunt could have offered at trial what it considered to be its best evidence that Fiskars was not entitled to lost profits, including the existence of any acceptable non-infringing alternatives. We see no reason why Hunt should be entitled to a second opportunity to present its case. Just as Rule 60(b)(6) is unavailable to reopen a judgment on grounds of newly discovered evidence (that existed at the time of trial), it is unavailable to reopen a judgment on the grounds that new evidence has come into being after the trial has been concluded. Accordingly, we conclude that the district court did not abuse its discretion in denying Hunt’s motion for relief from judgment under Rule 60(b)(6).
CONCLUSION
The judgment of the district court is
AFFIRMED.
Notes
.
See Rite-Hite Corp. v. Kelley Co.,
. Absence of acceptable non-infringing alternatives is one of four factors in the test for entitlement to lost profits damages articulated in
Panduit Corp. v. Stahlin Brothers Fibre Works, Inc.,