The Federal Circuit decides appeals addressing patent law, government contracts, trade disputes, tax appeals, suits against the federal government, veterans’ benefits, and federal employment cases. Federal Circuitry takes a data-driven look at the Federal Circuit. Our <a href="/statistics" target="_self">Federal Circuit Statistics</a> empirically analyze appeal timing, outcomes, and other quantifiable aspects of the Court.  Our <a href="/trackers/en-banc-tracker" target="_self">En Banc Tracker</a> shows pending and past petitions where the Court has called for a response. Our <a href="/trackers/substantive-orders-tracker" target="_self">Substantive Order Tracker</a> allows you to search for less-discussed and hard-to-find orders that affect practice before the Court. Check back weekly for <a href="/topics/last-week-in-the-federal-circuit" target="_self">Last Week in the Federal Circuit</a> and monthly for our <a href="/topics/oral-argument-recap" target="_self">Oral Argument Recap</a>.<h2>About Morrison Foerster's Appellate + Supreme Court Practice</h2>Morrison Foerster’s market-leading <a href="https://www.mofo.com/capabilities/appellate-supreme-court.html">Appellate and Supreme Court practice</a> wins appeals with deep strategic thinking, clear writing, and forceful oral advocacy. Our work spans the Supreme Court of the United States, every federal court of appeals, and state appellate courts in California, New York, and elsewhere. And we handle appeals in every area of law—from intellectual property to class actions, arbitration to antitrust, environmental law to ERISA. We are consistently ranked as one of the top appellate and Supreme Court practices in the country by Chambers USA and Legal 500 USA, and our practice has been named to the National Law Journal’s Appellate Hot List multiple times.<h2>About Morrison Foerster's Patent Litigation Practice</h2>We are a global <a href="https://www.mofo.com/capabilities/patent-litigation.html">IP litigation</a> powerhouse, dedicated to fiercely protecting innovation in high-stakes and complex patent litigation matters. While we are skilled at resolving disputes short of trial, some cases do see the inside of a courtroom. When they do, our trial lawyers stand out for their superb knowledge of patent law, experience with judges in high-volume patent venues, facility with explaining cutting-edge technologies to juries, and history defending against patent assertion entities and other habitual plaintiffs. From cross-border matters and multiparty disputes to global litigation management and NPE litigations, we develop novel solutions to protecting and enforcing some of the most prized patents in the world.<h2>About Morrison Foerster</h2>Morrison Foerster is a leading global law firm that transforms complexity into advantage for its clients. Our clients include some of the largest financial institutions, banks, consulting and accounting firms, and Fortune 100, technology, and life sciences companies. Highlighting the firm’s commitment to client service, leadership in market-changing deals and impact litigation, and values-based culture, Morrison Foerster has been repeatedly recognized as one of the top 10 firms on The American Lawyer’s A-List. Year after year, the firm receives significant recognition from Chambers and The Legal 500 across their various guides, including Global, USA, Asia‑Pacific, Europe, UK, Latin America, and FinTech Legal. Our lawyers passionately care about delivering legal excellence while living our values. Morrison Foerster has a long-standing commitment to creating a culture that respects and celebrates differences, while providing an inclusive environment. The firm has achieved Mansfield Certification Plus since 2018 as a result of successfully reaching at least 30 percent women, communities of color, and LGBTQ+ lawyer representation in a notable number of current leadership roles and committees. The firm also has a long history of commitment to the community and society through providing pro bono legal services, including litigating for civil rights and civil liberties, improving public education and fostering the wellbeing of children, advocating for veterans, promoting international human rights, enforcing the right to asylum, and safeguarding the environment.

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Brian Matsui co-chairs Morrison Foerster’s Appellate and Supreme Court practice. Brian is a go-to appellate advocate for sophisticated clients in complex appeals nationwide. Brian has a nationwide appellate practice. He has argued many cases in federal and state appellate courts throughout the country, winning appeals involving federal preemption, securities litigation and enforcement, consumer class actions, and intellectual property. He has led appeals in the D.C., Second, Fourth, Fifth, Ninth, Eleventh, and Federal Circuits. His arguments include significant victories in class action appeals and in appeals for leading financial services companies, with multiple victories in the Ninth Circuit, where he clerked. Brian recently has gone five for five when representing appellants, including a precedential victory in the Ninth Circuit in a licensing dispute concerning alleged patent misuse. He also argued and won a D.C. Circuit appeal against the Securities and Exchange Commission (SEC) about the retroactivity of part of the Dodd-Frank Act. As a result of Brian’s win, the SEC had to change its enforcement practices against certain securities industry professionals.Clients frequently turn to Brian for his substantial experience with appeals in the Federal Circuit, praising him as “an invaluable advocate in patent matters” (Chambers USA). Brian has won 13 of his last 14 appeals in that Court. His arguments before the Federal Circuit include winning appeals from district courts, the Patent Trial and Appeal Board, and the International Trade Commission. He has handled appeals in a myriad of industries, including mobile devices, pharmaceuticals, medical devices, semiconductors, and software.Brian also plays a key role on trial teams, advising clients on both critical legal issues and appellate preservation. He recently argued and prevailed against a summary judgment invalidity motion in a case involving Chugai Pharmaceutical Co. Ltd.’s revolutionary antibody recycling technology, which ultimately led to a $775 million settlement on the eve of trial for Chugai.A former law clerk for the United States Supreme Court, Brian has authored many briefs in that Court, including on important constitutional and statutory interpretation issues. He often represents clients’ interests in amicus briefs in significant Supreme Court cases affecting the business community.Leading publications have recognized Brian for his appellate skills. The Legal 500 US recommends him for appellate litigation, and the National Law Journal named Brian a “Minority 40 Under 40.”Brian is an editor of Morrison Foerster’s <a href="https://federalcircuitry.mofo.com/" target="_blank">Federal Circuitry</a> blog, which takes a data-driven approach to analyzing the Federal Circuit and its decisions.Brian also dedicates significant time to pro bono matters. He argued and won two significant appeals—in the Second and Ninth Circuits—obtaining reversals of judgments that had denied private rights of action under the Child Welfare Act in precedential decisions. Brian also led the Morrison Foerster team who co-counseled a successful Eighth Amendment challenge to Florida’s imposition of a “life without the possibility of parole” sentence to a juvenile offender convicted of a non-homicide crime.For years, Brian chaired the ABA’s seven-person Standing Committee for Amicus Curiae Briefs. He served on the American Intellectual Property Law Association’s amicus committee and co-chaired the National Asian Pacific American Bar Association’s amicus committee. Brian served as an appellate lawyer representative for the Ninth Circuit. Brian also serves on the board of directors for the Lawyers’ Committee for Civil Rights Under Law.Before entering private practice, Brian clerked on the United States Supreme Court for Justice Anthony M. Kennedy. He also clerked for Judge Pamela Ann Rymer in the Ninth Circuit and Judge David F. Levi in the Eastern District of California.While in law school, Brian served as managing editor of Volume 51 of the Stanford Law Review and was elected to the Order of the Coif.<h4>Representative Oral Arguments</h4><ul><li><a href="https://oralarguments.cafc.uscourts.gov/default.aspx?fl=22-1260_02102023.mp3" target="_blank">SNIPR Technologies Ltd. v. Rockefeller University </a>(Fed. Cir.) Prevailed in a precedential decision reversing the Patent Office’s interpretation of the America Invents Act (AIA) that subjected patents post-dating the Act to pre-AIA interference proceedings. The decision revived five of SNIPR’s patents related to CRISPR technology.</li><li><a href="/resources/video-audio/220114-broadcom-corporation-v-renesas-matsui" target="_blank">Renesas Electronics Corporation v. Broadcom Corporation</a> (12:40) (Fed. Cir.) Successfully argued and briefed multiple appeals from an International Trade Commission (ITC) decision and several Patent Trial and Appeal Board decisions related to an ITC investigation initiated by Broadcom involving systems-on-chip powering automobile infotainment systems.</li><li><a href="/resources/video-audio/210706-cr-bard-v-medline-industries" target="_self">C.R. Bard Inc. v. Medline Industries, Inc.</a> (0:45) (Fed. Cir.) Won vacatur of three Patent Trial and Appeal Board decisions on obviousness.</li><li><a href="https://oralarguments.cafc.uscourts.gov/default.aspx?fl=21-1745_03102022.mp3" target="_blank">Advanced Voice Recognition Systems, Inc. v. Apple Inc.</a> (14:30) (Fed. Cir.) Secured a complete victory in appeal from Patent Trial and Appeal Board that all challenged patent claims were unpatentable.</li><li><a href="/resources/video-audio/200515-william-paulus-v-ocera-therapeutics-inc.html" target="_self">William Paulus v. Ocera Therapeutics, Inc.</a> (13:25) (9th Cir.) Successfully argued and briefed appeal in a putative shareholder class action involving a tender offer.</li><li><a href="/resources/video-audio/200410-kurtz-v-costco.html" target="_blank">Kurtz v. Costco Wholesale Corporation </a>(9:23) (2d Cir.) Successfully petitioned for review of a class certification decision, then argued and obtained a remand for the district court to reconsider its certification decision and an eventual reversal on an injunctive class certification decision.</li><li><a href="/resources/video-audio/161117-gregory-bartko-v-sec.html" target="_self">Gregory Bartko v. SEC</a> (0:53) (D.C. Cir.) Successfully argued and obtained precedential ruling that the Securities and Exchange Commission could not retroactively apply Dodd-Frank’s industry-wide sanctions on securities professionals for certain securities violations.</li></ul>

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Partner

Brian Matsui is a partner in Morrison Foerster’s Appellate and Supreme Court practice. For nearly 20 years, Brian has been a go-to appellate advocate for sophisticated clients in complex appeals nationwide. Clients turn to Brian for his substantial experience in patent appeals in the Federal Circuit. He has argued more than 10 times in that Court, winning appeals from both district courts and the Patent Trial and Appeal Board. Brian excels at applying significant legal principles to complex technologies in a way that distills them for the Court. He has done so for companies in a myriad of industries, including mobile device manufacturers, pharmaceutical companies, medical device companies, memory manufacturers, movie studios, and software companies.

Brian Matsui

Seth Lloyd, a member of Morrison Foerster’s Appellate and Supreme Court practice, has been counsel in more than a hundred appeals in federal and state courts nationwide. Seth has presented oral arguments in the U.S. Courts of Appeals for the D.C. Circuit, the Seventh Circuit, the Ninth Circuit, and the Federal Circuit, as well as in the New Jersey Appellate Division.Seth has particular experience in patent appeals before the Federal Circuit. He has authored successful briefs for both patentees and defendants on a wide range of technologies, from medical devices to pharmaceuticals to computer hardware and software. His practice includes appeals from district courts, the Patent Trial and Appeal Board, and the International Trade Commission. Seth also has argued five times in the Federal Circuit. His winning arguments include a successful reversal of three PTAB decisions in a consolidated appeal for a computer memory designer. Seth is co-chair of the Federal Circuit Bar Association’s Administrative Law & Regulatory Committee. And he is an Editor of Morrison Foerster’s <a href="https://federalcircuitry.mofo.com/" target="_blank">Federal Circuitry</a> blog, which takes a data-driven approach to analyzing the Federal Circuit and its decisions.Seth regularly practices in the United States Supreme Court. He has drafted petitions and amicus briefs at the certiorari stage, as well as party and amicus briefs at the merits stage. Seth also moots members of the bar for Supreme Court arguments through the Georgetown Supreme Court Institute and is a member of the Edward Coke Appellate Inn of Court.Seth’s clients and peers recognize his expertise. Legal 500 named Seth a Key Lawyer; Super Lawyers called him a Rising Star; and Best Lawyers in America added him to its Ones to Watch list, all for appellate practice. Before joining Morrison Foerster, Seth served as a law clerk for Judge Richard G. Taranto of the Federal Circuit. He earned his J.D. from Stanford Law School, where he worked on two successful certiorari petitions and one successful merits case through Stanford’s Supreme Court Litigation Clinic.Seth also holds a Ph.D. and M.S. in electrical engineering from Stanford University. During his graduate studies, he received the National Defense Science and Engineering Graduate Fellowship, published 10 peer-reviewed articles, and co-invented the subject matter of five U.S. patents.<h4>Appellate Arguments</h4><ul><li><a href="/resources/video-audio/220114-renesas-electronics-v-broadcom-corporation" target="_self">Renesas Electronics Corp. v. Broadcom Corp.</a> (00:10) (Fed. Cir.) Argued and won affirmance for inter partes review petitioner in challenge to electronic device claims</li><li><a href="/resources/video-audio/170609-netlist-inc-v-diablo-technologies" target="_self">Netlist, Inc. v. Diablo Technologies, Inc.</a> (02:56) (Fed. Cir.) Argued and won reversal for owner of computer memory patents in appeals from three consolidated inter partes reviews</li><li><a href="/resources/video-audio/200610-google-llc-v-netlist-inc" target="_self">Google LLC v. Netlist, Inc.</a> (13:15) (Fed. Cir.) Argued and won affirmance for owner of computer memory patents in consolidated appeals from decade-long reexamination</li><li><a href="/resources/video-audio/220309-apple-inc-v-mph-technologies" target="_self">Apple Inc. v. MPH Technologies Oy</a> (00:16) (Fed. Cir.) Argued for inter partes review petitioner in challenge to computer security claims</li><li><a href="/resources/video-audio/180808-netlist-inc-v-sandisk-llc" target="_self">Netlist, Inc. v. SanDisk LLC</a> (01:53) (Fed. Cir.) Argued for patent owner in consolidated appeals raising APA challenges to inter partes review decisions</li><li><a href="/resources/video-audio/201026-nicole-k-v-stigdon" target="_self">Nicole K. v. Stigdon</a> (00:16) (7th Cir.) Argued for children in Indiana foster care raising constitutional due process claims</li><li><a href="/resources/video-audio/200306-strike-3-holdings" target="_self">Strike 3 Holdings, LLC v. Doe</a> (21:40) (D.C. Cir.) Argued as court-appointed amicus defending an order refusing a subpoena to unmask an internet subscriber’s identity</li><li><a href="/resources/video-audio/161118-harris-v-mangum" target="_self">Harris v. Mangum</a> (00:02) (9th Cir.) Argued as court-appointed amicus defending indigent prisoner’s right to a guardian ad litem</li></ul><h4>Additional Representative Matters</h4><ul><li>SNIPR Technologies Ltd. v. Rockefeller University (Fed. Cir.) Revived five SNIPR patents related to CRISPR technology after prevailing in a precedential decision that reversed the Patent Office’s interpretation of the America Invents Act (AIA), under which post-AIA patents could be subjected to pre-AIA interference proceedings</li><li>Broadcom Corp. v. International Trade Commission (Fed. Cir.) Successfully defended ITC’s determination of no Section 337 violation in case involving multiple patents directed to system-on-chip technology for automobile infotainment systems</li><li>Chugai Pharmaceutical Co. v. Alexion Pharmaceuticals (D. Del.) Successfully beat back defendant’s push for summary judgment of invalidity for lack of written description on pharmaceutical genus claims, ultimately helping to secure a $775 million settlement for the patent owner</li><li>C.R. Bard Inc. v. AngioDynamics, Inc. (Fed. Cir.) Secured reversal of district court judgment of non-infringement, no willfulness, and invalidity, reviving Bard’s infringement case on three patents</li><li>Washington University v. Wisconsin Alumni Research Foundation (3d Cir.) Successfully defended trial victory for breach of patent licensing agreement and further won judgment entitling Washington University to prejudgment interest</li><li>Nevro Corp. v. Boston Scientific Corp. (Fed. Cir.) Secured reversal for Nevro of district court judgment of invalidity for indefiniteness</li><li>Federal National Mortgage Association v. Zabriskie (9th Cir.) Won reversal for Fannie Mae of a Fair Credit Reporting Act judgment</li><li>Henson v. Santander Consumer USA Inc. (S. Ct.) Represented U.S. Chamber of Commerce and others as amici supporting respondent in unanimous affirmance of Fair Debt Collection Act decision</li><li>BASF Corp. v. Johnson Matthey Inc. (Fed. Cir.) Won reversal of an invalidity ruling against patentee BASF, reviving its patent claims</li><li>C.R. Bard Inc. v. Medline Industries, Inc. (Fed. Cir.) Won vacatur for petitioner of three Patent Trial and Appeal Board decisions on obviousness for patents to medical device technology</li><li>Altayyar v. Etsy, Inc. (2d Cir.) Secured dismissal of securities fraud case for failure to adequately plead falsity</li><li>Bridge & Post, Inc. v. Verizon Communications, Inc. (Fed. Cir.) Secured dismissal because asserted patents claimed unpatentable subject matter</li><li>Sam Francis Foundation v. Christie’s, Inc. (S. Ct.) Successfully preserved Sotheby’s en banc win at the Ninth Circuit based on the dormant Commerce Clause</li><li>Phigenix, Inc. v. Genentech, Inc. (Fed. Cir.) Secured total victory of noninfringement for Genentech</li><li>Deason v. Fujifilm Holdings Corp. (New York Appellate Division, First Department) Secured reversal in major shareholder challenge to corporate acquisition</li><li>V.L. v. E.L. (S. Ct.) As counsel for children’s guardian ad litem, secured reversal of Alabama Supreme Court’s refusal to grant full faith and credit to Georgia judgment recognizing lesbian mother as legal parent</li></ul>

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Of Counsel

Seth Lloyd is an associate in Morrison Foerster’s Appellate and Supreme Court Practice with broad experience briefing and arguing appeals. Seth has particular experience in patent appeals before the Federal Circuit. He has been a primary author of successful briefs on a wide range of technologies, from medical devices to chemistry to computer hardware and software. He also has successfully argued multiple times in that Court, including obtaining reversal of three Patent Trial and Appeal Board decisions in a consolidated appeal for a computer memory designer. Before joining Morrison Foerster, Seth served as a law clerk for Judge Richard G. Taranto of the Federal Circuit. He earned his J.D. from Stanford Law School and also holds a Ph.D. in electrical engineering from Stanford University.

Seth Lloyd is an associate in Morrison Foerster’s Appellate and Supreme Court Practice with broad experience briefing and arguing appeals. Seth has particular experience in patent appeals before the Federal Circuit. He has been a primary author of successful briefs on a wide range of technologies, from medical devices to chemistry to computer hardware and software. He also has successfully argued multiple times in that Court, including obtaining reversal of three Patent Trial and Appeal Board decisions in a consolidated appeal for a computer memory designer. Before joining Morrison & Foerster, Seth served as a law clerk for Judge Richard G. Taranto of the Federal Circuit. He earned his J.D. from Stanford Law School and also holds a Ph.D. in electrical engineering from Stanford University.

Seth Lloyd

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Federal Circuitry is a data-driven Federal Circuit blog. Our <a href="https://federalcircuitry.mofo.com/statistics">Federal Circuit Statistics</a> empirically analyze quantifiable aspects of the Court. Our <a href="https://federalcircuitry.mofo.com/trackers/en-banc-tracker">En Banc Tracker</a> highlights pending and past petitions. Our <a href="https://federalcircuitry.mofo.com/trackers/substantive-orders-tracker">Substantive Order Tracker</a> allows you to search less-discussed orders. Check back weekly for <a href="https://federalcircuitry.mofo.com/topics/last-week-in-the-federal-circuit" target="_self">Last Week in the Federal Circuit</a> and monthly for our <a href="https://federalcircuitry.mofo.com/topics/oral-argument-recap" target="_self">Oral Argument Recap</a>. Follow us on Twitter <a href="https://twitter.com/Fed_Circuitry" target="_blank">@Fed_Circuitry</a>.

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If last week’s post on prosecution disclaimer left you hoping for more decisions about the patent application process, you're in luck. This week we're covering 

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Many petitions for rehearing are filed; only the smallest handful are granted. Rather than track every filed petition, we track those that have a chance. Our database tracks petitions for rehearing once the Federal Circuit has called for a response (CFR). A CFR is the first real indication that the Court might have interest in the petition, as it indicates that at least one judge on the Court may be taking a second look. Our En Banc Tracker allows you to see the amount of time it takes for various cases to get a CFR, and you can sift through the data to see what types of cases have captured the potential attention of the Court. Our data goes back to January 2020.<div data-reactroot=""><iframe allowfullscreen="" frameBorder="0" height="2350" width="100%" src="https://public.tableau.com/views/RehearingCFRsandSubstantiveOrders/RehearingCFRs?:language=en&amp;:display_count=y&amp;:origin=viz_share_link&amp;:showVizHome=no&amp;:embed=yes&amp;:showShareOptions=false"></iframe><style media="(min-width:48.0625em)">#embed-wrapper-839223549{padding: 0 0 2350px;}</style></div>

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Last Week in the Federal Circuit (June 7-11):  Prosecution Laches—Following the Letter of the Law May Not Always Be Enough

Last Week in the Federal Circuit (June 7-11):  Prosecution Laches—Following the Letter of the Law May Not Always Be Enough | Federal Circuitry

Last Week in the Federal Circuit (June 7-11):  Prosecution Laches—Following the Letter of the Law May Not Always Be Enough | Federal Circuit Blog - News & Statistics | Federal Circuitry

If <a href="/topics/Last-Week-in-the-Federal-Circuit-June-14-Prosecution-Disclaimer--Whats-Good-for-the-Goose-.html" target="_blank">last week’s</a> post on prosecution disclaimer left you hoping for more decisions about the patent application process, you're in luck. This week we're covering another case about patent prosecution and the somewhat rare doctrine of prosecution laches. Below we provide our usualy weekly statistics and our case of the week—our highly subjective selection based on whatever case piqued our interest.Precedential opinions:  7Non-precedential opinions: 5Rule 36: 3Longest pending case from argument:<a href="http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/20-1086.OPINION.6-10-2021_1788770.pdf">Anania v. McDonough</a>, No. 20-1086 (185 days)Shortest pending case from argument (non-Rule 36):  <a href="http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/20-1839.OPINION.6-9-2021_1788218.pdf">Cameron v. McDonough</a>, No. 20-1839 (33 days)Case of the week:<a href="http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/18-2390.OPINION.6-1-2021_1784662.pdf">Hyatt v. Hirshfeld</a>, Nos. 2018-2390, -2391, -2392, 2019-1038, -1039, -1049, -1070 (June 1, 2021)Panel:  Judges Reyna, Wallach, and Hughes, with Judge Reyna writing the opinionYou should read this case if:  you are a patent prosecutor or are curious about the latest chapter in a long-running dispute between the Patent Office and a serial patent applicantOur case this week features independent inventor, Gilbert Hyatt, who filed an astonishing 381 patent applications during the “GATT Bubble” before the PTO’s June 8, 1995 transition from patent terms of 17 years from issuance to 20 years from filing. The applications largely relate to microchip and integrated circuit technology and are continuations of applications that date back to the 1970s and ’80s. Most are still pending. Any patents that issue will remain valid for 17 years from issuance, even though the original applications are decades old. The PTO calculated that processing Hyatt’s applications would require “532 years of examiner time,” or the equivalent of about “40,000 typical applications.”After the PTO rejected four Hyatt applications, Hyatt filed suit under 35 U.S.C. § 145, which allows applicants to seek a court order requiring the PTO to issue the patents. The PTO moved to dismiss based on prosecution laches, a defense the PTO had never before asserted in a district court case on pending applications. According to the PTO, Hyatt engaged in a pattern of delay during prosecution, filing overly long and complex applications, and repeatedly amending claims to shift their scope and create duplications. The district court sided with Hyatt, however, finding that substantial blame for the delay rested with the PTO and that prosecution laches did not bar issuance of the applications. The court ultimately ordered the PTO to issue many of Hyatt’s claims.On appeal, the Federal Circuit reached several important holdings about prosecution laches. As a preliminary matter, it held that prosecution laches can be a defense in a Section 145 action. And it held that the defense was available even if the Patent Office never rejected the claims for laches during examination.The Court explained that prosecution laches can “‘render a patent unenforceable when it has issued only after an unreasonable and unexplained delay in prosecution that constitutes an egregious misuse of the statutory patent system under a totality of the circumstances.’”  The Court held that the district court had failed to assess the totality of the circumstances in deciding whether that standard was met. For example, the district court should have considered evidence tending to show Hyatt’s “pattern of conduct across an enormous body of similar applications” beyond the four at issue. The Federal Circuit also found that the district court overemphasized alleged PTO delays and underemphasized Hyatt’s behavior in prosecution:It is not the case that an applicant may prosecute his patents however he or she wishes within the statute and PTO regulation, because the doctrine of prosecution laches places an additional, equitable restriction on patent prosecution conduct beyond those imposed by statute or PTO regulation. An applicant must therefore not only comply with the statutory requirements and PTO regulations but must also prosecute its applications in an equitable way that avoids unreasonable, unexplained delay that prejudices others.Further, the PTO’s conduct may be considered in the totality of circumstances, but its delay “cannot excuse the applicant’s own delay” in prosecution.The Federal Circuit also refined the standard for applying prosecution laches in a Section 145 action: it determined that, like in infringement actions, the PTO has an obligation to show prejudice in order for prosecution laches to apply. The Federal Circuit further concluded, however, that prejudice is presumptively met by a prosecution delay of six years or more. And finally, the Federal Circuit held that “clear abuse of the PTO’s patent examination system” constitutes prejudice. “Clear abuse” occurs when the applicant “unduly increases the administrative burden on the PTO.”Given these conclusions, the Federal Circuit determined that the PTO sufficiently met its initial burden with respect to prosecution laches. The burden thus shifted to Hyatt to prove that he did not, in fact, engage in unreasonable or unexplainable delay. The Court remanded for the district court to consider evidence and decide that issue in the first instance.