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Volume XI, Number 214


August 02, 2021

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July 30, 2021

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The Renewed Importance of Opinions of Counsel in Patent Infringement Actions

Several recent court decisions in patent infringement actions reflect the significant impact of the Supreme Court's ruling in Halo Electronics, Inc. v. Pulse Electronics, Inc.[1], which dramatically altered the landscape for proving and obtaining enhanced damages in patent infringement cases. Many courts have exercised the discretion afforded by Halo to place the issue of whether an accused infringer's conduct was willful—thus giving rise to enhanced damages—firmly in the hands of the jury to decide.[2]

This alert describes in detail how the Halo decision has changed the standard for enhanced damages awards, the underlying rationale behind the change in law, and how in-house lawyers and executives should adjust their opinion practices to mitigate the increased threat of enhanced damages. At a minimum, companies should seek to obtain an opinion of counsel as soon as the threat of an infringement lawsuit emerges (and in any event, prior to actual litigation) that evinces an accused infringer’s good faith belief that it does not infringe or that the asserted patent is invalid.  


Section 284 of the Patent Act states that, where infringement occurs, courts "may increase the damages up to three times the amount found or assessed."   Such treble damages have generally been reserved for cases of "willful or bad-faith infringement[3].

Over the past decade, courts have used a two-part test for willful infringement fashioned by the Federal Circuit in the Seagate[4] case. There, the Court held a finding of willful infringement requires that the patentee prove by clear and convincing evidence that:

(1)  the defendant acted despite "an objectively high likelihood that its actions constituted infringement of a valid patent" (also called the "objective recklessness" prong) and

(2)  the objectively high likelihood was "either known or so obvious that it should have been known" to the defendant (also called the "subjective recklessness" prong).   

The Seagate decision also expressly discarded any affirmative obligation on the part of defendants to obtain an opinion of counsel. Finally, Seagate resulted in a trifurcated standard for reviewing willfulness findings on appeal: (1) the objective recklessness prong was reviewed de novo; (2) the subjective recklessness prong was reviewed for substantial evidence; and (3) the ultimate decision whether to enhance damages was reviewed for whether the district court abused its discretion[5].

Post-Seagate, willful infringement became extremely hard to prove, leading to a decrease in enhanced damages awards and thereby reducing the need for potential infringers to obtain formal opinions of counsel.

The Supreme Court Relaxes the Willful Infringement Standard

Now with Halo, the Supreme Court has eliminated the rigid Seagate test for determining whether a district court may increase damages for patent infringement in favor of a more deferential standard. In discarding Seagate as being inconsistent with §284, the Court confirmed that "[t]he subjective recklessness of a patent infringer, intentional or knowing, may warrant enhanced damages, without regard to whether his infringement was objectively reckless." 

The Court's opinion focused on allowing district courts to use their discretion to consider the application of enhanced damages more freely, especially in cases of a "'wanton and malicious pirate' who intentionally infringes another's patent—with no doubts about its validity or any notion of a defense—for no purpose other than to steal the patentee's business."  In addition, the Court emphasized that a defendant's ability to raise reasonable defenses at trial should no longer preempt a finding of willful infringement because willfulness is measured against the defendant's knowledge and intent at the time of its alleged willful conduct, not at the time of trial.

The Court was careful to explain, however, that a district court's discretion has limits, and emphasized that the award of enhanced damages should be "generally reserved for egregious cases of culpable behavior." As such, the Court noted that the imposition of enhanced damages is not appropriate in the typical infringement case.

The Court also clarified two other issues in its opinion. First, willful infringement no longer must be proven by clear and convincing evidence but rather by a preponderance of the evidence. The Court found that Section 284 does not impose any specific evidentiary burden, and the preponderance standard governs most other aspects of patent infringement litigation. Second, on appeal, willful infringement findings should be reviewed only for abuse of discretion—instead of the tripartite standard set forth in Seagate.

The holding and analysis set forth in Halo is not surprising, given the groundwork laid by the Supreme Court a couple of years ago in two cases evaluating a closely-related area of patent law[6]. The Court rejected a similarly rigid Federal Circuit test for the award of attorney's fees in exceptional cases under 35 U.S.C. §285, and returned such considerations to the discretion of the district courts. The Court also lowered the standard of proof under Section 285 from clear and convincing to a preponderance of the evidence. And, the Court confirmed that appeals of attorney's fees awards under §285 should be reviewed for abuse of discretion.

Post-Halo, Opinions of Counsel Take On Increased Importance

In view of Halo, the threat of enhanced damages is a real concern once again for any entity whose activities could give rise to claims of patent infringement. Because an infringer's subjective belief is a factual issue, it appears that juries will play a larger role in determining whether willful infringement exists. Therefore, obtaining a well-reasoned opinion of counsel for instances of possible infringement is crucial to reduce the risk of enhanced damages being imposed at trial.

Ideally, opinion counsel should be engaged as soon as a threat of infringement emerges—whether via receipt of a complaint, demand letter or other communication from a patentee, or even if internal concerns exist regarding a patent's applicability to your activities or products. Under Halo, opinions that are obtained after the commencement of litigation are afforded less weight.

Opinions may take a variety of forms that are typically commensurate with the threat posed by the asserted patent. In cases where a high-level read of the patent suggests minimal risk of infringement, a simple claim chart opinion may be appropriate. In cases where circumstances require a deeper dive into the patent and the accused activity to ascertain a viable non-infringement position, a formal opinion letter may make sense.

However, while an opinion of counsel is useful to mitigate a finding of willfulness, reliance on the opinion during litigation invokes a waiver of attorney-client privilege with respect to the subject matter of the opinion. This waiver implicates communications with outside counsel as well as in-house counsel and executives involved in developing and reviewing the opinion.

Care should also be taken when selecting opinion counsel if you are already involved in litigation, as some cases suggest the waiver of attorney-client privilege could extend to trial counsel if they are also involved in the opinion work. If feasible, your opinion counsel should be at a different firm than your trial counsel. At the very least, opinion counsel should comprise different lawyers than your trial team. The same principle applies to in-house counsel:  clients should monitor the role of inside lawyers overseeing the opinion to ensure that they are not too closely involved in the litigation.


The more-relaxed standard set forth in the Halo decision will have a significant impact on the evaluation of willful infringement claims at both the district court and appeals court levels—providing greater opportunity for lower courts to impose enhanced damages on accused infringers and for the Federal Circuit to uphold such damages awards. As a result, an uptick in opinion activity is expected on the part of potential infringers to safeguard against possible charges of willfulness during litigation.

[1] Halo Electronics, Inc. v. Pulse Electronics, Inc., et al., 579 U.S. __, No. 14-1513, andStryker Corp et al. v. Zimmer, Inc., et al., No. 14-1520.

[2] See, e.g., WBIP, LLC v. Kohler Co.,Case Nos. 2015-1038, -1044, 2016 U.S. App. LEXIS 13136 at *49-50 (Fed. Cir. 2016); Transdata Inc. v. Denton Municipal Electric, No. 6:10-cv-00557, Dkt No. 259 (E.D. Tex. June 29, 2016); Presidio Components Inc. v. Am. Tech. Ceramics Corp., No. 14-cv-02061, 2016 U.S. Dist. LEXIS 82532 (S.D. Cal. June 17, 2016);Sociedad Espanola v. Blue Ridge X-Ray Co., No. 1:10-cv-00159, 2016 U.S. Dist. LEXIS 88739 (W.D.N.C. July 8, 2016); Viva Healthcare Packaging USA Inc. v. CTL Packaging USA Inc., No. 3:13-cv-00569, 2016 U.S. Dist. LEXIS 90130 (W.D.N.C. July 11, 2016); PPC Broadband Inc. v. Corning Optical Comms., 5:11-cv-761, 2016 U.S. Dist. LEXIS 78408 (N.D.N.Y. June 16, 2016).

[3] Aro Mfg. Co. v. Convertible Top Replacement Co., 377 U.S. 476, 505, n. 20 (1964).

[4] In re Seagate Technology, LLC, 497 F.3d 1360 (Fed. Cir. 2007).

[5] See Bard Peripheral Vascular, Inc. v. W. L. Gore & Assoc., Inc., 682 F. 3d 1003, 1005, 1008 (Fed. Cir. 2012); Spectralytics, Inc. v. Cordis Corp., 649 F. 3d 1336, 1347 (Fed. Cir. 2011).

[6] See Octane Fitness, LLC v. ICON Health & Fitness, Inc., 572 U.S. __ (2014) andHighmark Inc. v. Allcare Health Management System, Inc., 572 U.S. __ (2014).

© 2021 Proskauer Rose LLP. National Law Review, Volume VI, Number 228

About this Author

Steven Bauer, Complex Patent, Trade Secret, Trademark, Litigator, Proskauer Rose Law Firm

Steven M. Bauer is a trial lawyer who practices exclusively in the areas of complex patent, trade secret, trademark, copyright and technology litigation. Based in the Boston office, he is co-chair of the firm's nationwide Litigation Department, and within it, co-head of the firm's Patent Litigation Group. He has also served on the firm's seven-member Executive Committee.

Chambers USA has consistently ranked Steve as one of only a handful of "Band 1" patent litigators in Boston, noting his reputation as "the litigator that clients want" and that clients call him "results-...

Joseph Capraro, Patent Law, Intellectual Property, Attorney, Proskauer Rose Law Firm

Joseph A. Capraro is a partner in the Patent Law and Intellectual Property Groups and head of the Boston office where he leads the patent and trademark prosecution and technology licensing groups. Over the course of his career, Joe has developed broad experience in connection with the protection and enforcement of intellectual property rights. He provides clients with practical legal advice across the entire spectrum of intellectual property areas, including strategic intellectual property portfolio development, patent and trademark prosecution, technology licensing, intellectual property...

Kimberly A. Mottley, Intellectual Property Disputes Attorney, Proskauer Rose Law FIrm

Kimberly A. Mottley is a partner in Proskauer’s Litigation Department. She practices exclusively in the area of complex intellectual property disputes, with a primary focus on patent and trademark infringement matters. Kim has counseled her clients through all phases of litigation, including case preparation and strategy, obtaining temporary restraining orders, discovery, Markman hearings, settlement negotiations and alternative dispute resolution, trial and appeals before the Federal Circuit.

Kenneth Rubenstein, Patent Attorney, Proskauer Rose Law FIrm

Kenneth Rubenstein is co-head of the Patent Law Group and a partner in the New York office. He also is a registered patent attorney before the U.S. Patent & Trademark Office and a former member of the legal staff at Bell Laboratories. While there are numerous patent law groups at various firms, Ken and his group distinguish themselves from competitors by being able to deal with very sophisticated technology.

James H Shalek, Litigator, Patent Disputes, trademark, Proskauer Rose Law Firm

James H. Shalek is a partner in the Litigation Department and head of the Patent Law Group.

Jim has extensive experience litigating patent, trademark, trade secret and contractual matters in federal and state courts, and before the International Trade Commission and before arbitration tribunals. He has a gift for explaining complex technology in simple terms, and a record of success in patent cases involving a broad range of technologies that include:  immunoassays, antibodies, genetic engineering, wireless communications and voice-over Internet protocols, computer hardware,...