United States: Federal Circuit Decision Clarifies When An ANDA Filer May Appeal An Adverse IPR Ruling

In Amerigen Pharmaceuticals Limited v. UCB Pharma GmbH, generic drug manufacturer Amerigen appealed a decision of the Patent Trial & Appeal Board finding UCB’s patent to certain chemical derivatives of diphenylpropylamines not invalid. The court ultimately affirmed the Board’s decision. But first, the court held that Amerigen had standing to pursue the appeal.

At issue in Amerigen was UCB’s ’650 Patent, which relates to a urinary incontinence drug that UCB’s licensee, Pfizer, sells under the brand name Toviaz. The ’650 Patent expires in 2022 and is included in the FDA’s “Orange Book” entry for Toviaz, which lists all the patents covering the drug. Amerigen filed an ANDA for a competing generic version of Toviaz. In accordance with the requirements of the Hatch-Waxman Act, Amerigen included in its ANDA a “Paragraph IV Certification,” i.e., a declaration averring that its new drug would not infringe any of the patents on the Toviaz Orange Book entry, and that those patents are invalid or otherwise unenforceable in any event. UCB and Pfizer subsequently sued Amerigen for infringement in Delaware. The district court eventually held the ’650 Patent not invalid and infringed. As a result, Amerigen was barred from obtaining FDA approval, and therefore, could not launch its new drug until after the ’650 patent expired in 2022. The decision effectively foreclosed Amerigen from ever infringing the ’650 patent 

However, Amerigen also petitioned for inter partes review of the ’650 Patent. The Board, after instituting review on two obviousness grounds, ultimately ruled that the ’650 Patent is not invalid as obvious and denied the petition. Amerigen’s appeal followed. On appeal, UCB challenged whether Amerigen possessed Article III standing given that the FDA would not approve its product before expiration of the ’650 patent. According to UCB, without the possibility of infringement, no justiciable controversy existed between the parties.

The Federal Circuit disagreed. The court highlighted Amerigen’s factual representations that the FDA already tentatively approved its ANDA, and that its generic drug product would be ready for commercial sale in 2019, three years before the ’650 Patent expires. Relying on these representations (which it accepted as true for purposes of its standing analysis), the court reasoned that the ’650 Patent, unless invalidated, would delay Amerigen’s new drug launch by three years. But if the ’650 Patent were to be declared invalid before 2022, it would be removed from the Toviaz Orange Book entry, and Amerigen could “launch its competing product substantially earlier than it otherwise could.”  The court concluded that “Amerigen has a concrete, economic interest in the sales of its tentatively approved drug obstructed by the listing of the ’650 Patent [in the Orange Book], and has thereby demonstrated a controversy ‘of sufficient immediacy and reality’ for Article III standing.”

The Court thus held that the threatened harm underpinning Amerigen’s standing stemmed not from any risk of incurring infringement liability, but rather from “the mere listing of the ’650 patent in the Orange Book.”  As the court explained, Amerigen’s inability to launch its new drug because of the Orange Book listing constituted a “concrete commercial injury redressable [in] court.”

Practice tip:

Although Amerigen ultimately lost the appeal (since the Federal Circuit upheld the Board’s conclusions on obviousness and affirmed the ’650 Patent’s validity), Amerigen still was able to obtain appellate review of a patent that it could never incur liability for infringing, and that a district court already had held enforceable in a separate case. Going forward, parties should be aware that standing may exist to appeal a decision from the Board even if a prior activity, such as a district court litigation, has removed the possibility of infringement liability. The key is whether a party can demonstrate a controversy of sufficient immediacy that is traceable to the existence of a particular patent and redressable by the court.

Amerigen Pharmaceuticals Limited v. UCB Pharma GMBH, No. 2017-2596 (Fed. Cir. Jan. 11, 2019) (JJ Lourie, Chen, Stoll)

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

To print this article, all you need is to be registered on Mondaq.com.

Click to Login as an existing user or Register so you can print this article.

Similar Articles
Relevancy Powered by MondaqAI
In association with
Related Topics
Similar Articles
Relevancy Powered by MondaqAI
Related Articles
Related Video
Up-coming Events Search
Font Size:
Mondaq on Twitter
Mondaq Free Registration
Gain access to Mondaq global archive of over 375,000 articles covering 200 countries with a personalised News Alert and automatic login on this device.
Mondaq News Alert (some suggested topics and region)
Select Topics
Registration (please scroll down to set your data preferences)

Mondaq Ltd requires you to register and provide information that personally identifies you, including your content preferences, for three primary purposes (full details of Mondaq’s use of your personal data can be found in our Privacy and Cookies Notice):

  • To allow you to personalize the Mondaq websites you are visiting to show content ("Content") relevant to your interests.
  • To enable features such as password reminder, news alerts, email a colleague, and linking from Mondaq (and its affiliate sites) to your website.
  • To produce demographic feedback for our content providers ("Contributors") who contribute Content for free for your use.

Mondaq hopes that our registered users will support us in maintaining our free to view business model by consenting to our use of your personal data as described below.

Mondaq has a "free to view" business model. Our services are paid for by Contributors in exchange for Mondaq providing them with access to information about who accesses their content. Once personal data is transferred to our Contributors they become a data controller of this personal data. They use it to measure the response that their articles are receiving, as a form of market research. They may also use it to provide Mondaq users with information about their products and services.

Details of each Contributor to which your personal data will be transferred is clearly stated within the Content that you access. For full details of how this Contributor will use your personal data, you should review the Contributor’s own Privacy Notice.

Please indicate your preference below:

Yes, I am happy to support Mondaq in maintaining its free to view business model by agreeing to allow Mondaq to share my personal data with Contributors whose Content I access
No, I do not want Mondaq to share my personal data with Contributors

Also please let us know whether you are happy to receive communications promoting products and services offered by Mondaq:

Yes, I am happy to received promotional communications from Mondaq
No, please do not send me promotional communications from Mondaq
Terms & Conditions

Mondaq.com (the Website) is owned and managed by Mondaq Ltd (Mondaq). Mondaq grants you a non-exclusive, revocable licence to access the Website and associated services, such as the Mondaq News Alerts (Services), subject to and in consideration of your compliance with the following terms and conditions of use (Terms). Your use of the Website and/or Services constitutes your agreement to the Terms. Mondaq may terminate your use of the Website and Services if you are in breach of these Terms or if Mondaq decides to terminate the licence granted hereunder for any reason whatsoever.

Use of www.mondaq.com

To Use Mondaq.com you must be: eighteen (18) years old or over; legally capable of entering into binding contracts; and not in any way prohibited by the applicable law to enter into these Terms in the jurisdiction which you are currently located.

You may use the Website as an unregistered user, however, you are required to register as a user if you wish to read the full text of the Content or to receive the Services.

You may not modify, publish, transmit, transfer or sell, reproduce, create derivative works from, distribute, perform, link, display, or in any way exploit any of the Content, in whole or in part, except as expressly permitted in these Terms or with the prior written consent of Mondaq. You may not use electronic or other means to extract details or information from the Content. Nor shall you extract information about users or Contributors in order to offer them any services or products.

In your use of the Website and/or Services you shall: comply with all applicable laws, regulations, directives and legislations which apply to your Use of the Website and/or Services in whatever country you are physically located including without limitation any and all consumer law, export control laws and regulations; provide to us true, correct and accurate information and promptly inform us in the event that any information that you have provided to us changes or becomes inaccurate; notify Mondaq immediately of any circumstances where you have reason to believe that any Intellectual Property Rights or any other rights of any third party may have been infringed; co-operate with reasonable security or other checks or requests for information made by Mondaq from time to time; and at all times be fully liable for the breach of any of these Terms by a third party using your login details to access the Website and/or Services

however, you shall not: do anything likely to impair, interfere with or damage or cause harm or distress to any persons, or the network; do anything that will infringe any Intellectual Property Rights or other rights of Mondaq or any third party; or use the Website, Services and/or Content otherwise than in accordance with these Terms; use any trade marks or service marks of Mondaq or the Contributors, or do anything which may be seen to take unfair advantage of the reputation and goodwill of Mondaq or the Contributors, or the Website, Services and/or Content.

Mondaq reserves the right, in its sole discretion, to take any action that it deems necessary and appropriate in the event it considers that there is a breach or threatened breach of the Terms.

Mondaq’s Rights and Obligations

Unless otherwise expressly set out to the contrary, nothing in these Terms shall serve to transfer from Mondaq to you, any Intellectual Property Rights owned by and/or licensed to Mondaq and all rights, title and interest in and to such Intellectual Property Rights will remain exclusively with Mondaq and/or its licensors.

Mondaq shall use its reasonable endeavours to make the Website and Services available to you at all times, but we cannot guarantee an uninterrupted and fault free service.

Mondaq reserves the right to make changes to the services and/or the Website or part thereof, from time to time, and we may add, remove, modify and/or vary any elements of features and functionalities of the Website or the services.

Mondaq also reserves the right from time to time to monitor your Use of the Website and/or services.


The Content is general information only. It is not intended to constitute legal advice or seek to be the complete and comprehensive statement of the law, nor is it intended to address your specific requirements or provide advice on which reliance should be placed. Mondaq and/or its Contributors and other suppliers make no representations about the suitability of the information contained in the Content for any purpose. All Content provided "as is" without warranty of any kind. Mondaq and/or its Contributors and other suppliers hereby exclude and disclaim all representations, warranties or guarantees with regard to the Content, including all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement. To the maximum extent permitted by law, Mondaq expressly excludes all representations, warranties, obligations, and liabilities arising out of or in connection with all Content. In no event shall Mondaq and/or its respective suppliers be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use of the Content or performance of Mondaq’s Services.


Mondaq may alter or amend these Terms by amending them on the Website. By continuing to Use the Services and/or the Website after such amendment, you will be deemed to have accepted any amendment to these Terms.

These Terms shall be governed by and construed in accordance with the laws of England and Wales and you irrevocably submit to the exclusive jurisdiction of the courts of England and Wales to settle any dispute which may arise out of or in connection with these Terms. If you live outside the United Kingdom, English law shall apply only to the extent that English law shall not deprive you of any legal protection accorded in accordance with the law of the place where you are habitually resident ("Local Law"). In the event English law deprives you of any legal protection which is accorded to you under Local Law, then these terms shall be governed by Local Law and any dispute or claim arising out of or in connection with these Terms shall be subject to the non-exclusive jurisdiction of the courts where you are habitually resident.

You may print and keep a copy of these Terms, which form the entire agreement between you and Mondaq and supersede any other communications or advertising in respect of the Service and/or the Website.

No delay in exercising or non-exercise by you and/or Mondaq of any of its rights under or in connection with these Terms shall operate as a waiver or release of each of your or Mondaq’s right. Rather, any such waiver or release must be specifically granted in writing signed by the party granting it.

If any part of these Terms is held unenforceable, that part shall be enforced to the maximum extent permissible so as to give effect to the intent of the parties, and the Terms shall continue in full force and effect.

Mondaq shall not incur any liability to you on account of any loss or damage resulting from any delay or failure to perform all or any part of these Terms if such delay or failure is caused, in whole or in part, by events, occurrences, or causes beyond the control of Mondaq. Such events, occurrences or causes will include, without limitation, acts of God, strikes, lockouts, server and network failure, riots, acts of war, earthquakes, fire and explosions.

By clicking Register you state you have read and agree to our Terms and Conditions