Azurity Pharmaceuticals, Inc. v. Bionpharma Inc.

District Court, D. Delaware·Decided January 11, 2023·No. 1:21-cv-01455·Unknown

Opinion

INTHEUNITEDSTATESDISTRICTCOURT FORTHEDISTRICTOFDELAWARE

AZURITYPHARMACEUTICALS,INC., Plaintiff, CivilAction v. Nos. 21-cv-1286,21-cv-1455 BIONPHARMAINC., Defendant.

MEMORANDUMOPINION Goldberg, J.1 January 11, 2023 These cases comprise what the parties refer to as the “Third Wave” in an ongoing patent infringement dispute between Plaintiff Azurity Pharmaceuticals, Inc. (“Azurity”) and Defendant Bionpharma Inc. (“Bionpharma”). The parties’ dispute revolves around Bionpharma’s generic

enalapril oral liquid. Bionpharma’s counterclaims assert antitrust “sham litigation” claims under the Sherman Act, 15 U.S.C. §§ 2, 15, and 15/26" style="color:var(--green);border-bottom:1px solid var(--green-border)">26, alleging that Azurity brought these and other lawsuits in bad faith to stifle competition. Bionpharma claims that these lawsuits were objectively baseless and brought only to force Bionpharma to incur litigation costs and delay market entry for the duration of the 30-month stay applicable to Hatch-Waxman litigation. Before me is Azurity’s motion to dismiss the antitrust counterclaims. For the reasons that follow, Azurity’s motion will be denied.

1 Pursuantto28U.S.C.§292(b),IhavebeendesignatedtoserveasavisitingjudgefortheDistrict ofDelawaretohandlethismatterandotherDistrictofDelawarecases. I. FACTUALANDPROCEDURALBACKGROUND The following facts are taken from Bionpharma’s Answer and Counterclaims, and, where appropriate, matters of public record regrading the litigation history between Azurity and Bion-

pharma. These facts will be viewed in the light most favorable to Bionpharma. See Burtch v. MillbergFactors,Inc.,662F.3d212,221(3dCir.2011). A. Azurity’sEPANEDProductandRelatedPatents Azurity’s brand product EPANED is an oral liquid formulation of the blood pressure medicine enalapril. (Answer2 ¶ 9; Counterclaims ¶¶ 13, 34-35.) EPANED “is the only ready-to- use oral solution of enalapril, which caters to specific populations of patients that have trouble

swallowingsolidoraldosageforms.”(Counterclaims¶38.) From March 2016 to April 2021, Azurity filed nine patent applications for enalapril liq- uids, each a continuation of a prior application, and each with a priority date of March 18, 2016.3 The precise claim limitations differ from patent to patent, but the essence of each is a stable mix- ture of water, enalapril, and other ingredients such as buffers, preservatives, and sweeteners. The followingclaimsfromtwoofthosepatentsareillustrative: Astableoralliquidformulation,comprising: (i) about1mg/mlenalaprilmaleate; (ii) a buffer comprising about 1.82 mg/ml citric acid and about 0.15 mg/mL sodiumcitratedihydrate; (iii) about1mg/mlofapreservativethatissodiumbenzoate;and (iv) water; 2 Paragraph citations to “Answer” refer to Docket Entry 26 in 21-cv-1455. Paragraph citations to “Counterclaims”refertoparagraphsbeginningonpage10ofthatdocument. 3 TheseapplicationsissuedasU.S.PatentNos.9,669,008(the’008patent),11,040,023(the’023 patent), 11,141,405 (the ’405 patent), 9,808,442 (the ’442 patent), 10,786,482 (the ’482 patent), 10,918,621 (the ’621 patent), 10,039,745 (the ’745 patent), 10,772,868 (the ’868 patent), and 10,154,987(the’987patent). whereinthepHoftheformulationislessthanabout3.5;... whereintheformulationisstableatabout5±3°C.foratleast12months;[and] whereinthestableoralliquidformulationhasabout95%orgreateroftheinitial enalaprilamountandabout5%w/worlesstotalimpuritiesorrelatedsubstances attheendofthegivenstorageperiod. (Claim1ofthe’008patent.) Astableoralliquidformulation,comprising: (i) about 0.6 to about 1.2 mg/ml enalapril or a pharmaceutically acceptable saltorsolvatethereof; (ii) a buffer comprising about 0.8 to about 3.5 mg/ml citric acid and about 0.1toabout0.8mg/mlsodiumcitrate; (iii) about0.7toabout1.2mg/mlsodiumbenzoate;and (iv) water; whereintheformulationisstableatabout5±3°C.foratleast12months;and wherein the stable oral liquid formulation has about 95% w/w or greater of the initial enalapril amount and about 5% w/w or less total impurity or related sub- stancesattheendofthegivenstorageperiod. (Claim1ofthe’745patent.) B. Bionpharma’sANDA In August 2018, Bionpharma filed an abbreviated new drug application (ANDA) with the Food and Drug Administration (FDA) for a generic oral enalapril liquid. (Counterclaims ¶¶ 14, 63.) Bionpharma alleges that its ANDA differs from Azurity’s EPANED product in that it does not contain a buffer and uses a preservative consisting of parabens rather than sodium benzoate. (Counterclaims ¶ 61.) Bionpharma alleges it made these alterations to “design ... around” Azu- rity’spatents. (Id.) To date, Azurity has filed seven lawsuits in three separate courts regarding Bionpharma’s generic enalapril liquid—five against Bionpharma and two against Bionpharma’s contract manu- facturer,CoreRx.4 C. Bionpharma’sParagraphIVNoticetoAzurity

When a generic manufacturer files an ANDA, it must send a notice (a “Paragraph IV Notice”) to patentholders listed for the brand drug in the FDA’s “Orange Book.” See 21 U.S.C. § 355(j)(2)(B). In October 2018, Bionpharma sent a Paragraph IV Notice to Azurity regarding the ’008,’442,and’745patents. (Counterclaims¶64.) Bionpharma’s Paragraph IV Notice offered to provide Azurity with confidential access to Bionpharma’s ANDA, under terms similar to those used in prior litigation between Azurity and Bionpharma. (Counterclaims ¶ 65.) Bionpharma requested that Azurity agree not to share in-

formation with its patent prosecution counsel (an agreement called a “patent prosecution bar”) becauseAzurityhadpatentprosecutionopenforenalaprilliquidsandBionpharmawasconcerned that Azurity could file new applications targeted to Bionpharma’s ANDA. (Counterclaims ¶ 68.) Azurity declined the offer of confidential access, and Bionpharma alleges that Azurity did so be- cause Azurity was indifferent to the merits of its infringement position. (Counterclaims ¶¶ 65, 70-71.)

4 For reference, Azurity’s seven lawsuits over Bionpharma’s ANDA are summarized in the table below:

DocketNo. Defendant FiledIn FiledOn Patents D.Del.18-1962 Bionpharma D.Del. 12/12/2018 ’008,’442,’745 D.Del.19-1067 Bionpharma D.Del. 6/7/2019 ’987 D.Del.20-1256 Bionpharma D.Del. 9/18/2020 ’868,’482,’621 D.Del.21-1286 Bionpharma D.N.J. 6/22/2021 ’023 D.Del.21-1455 Bionpharma D.Del. 10/15/2021 ’405 M.D.Fla. 21-2515 CoreRx M.D.Fla. 10/26/2021 ’023,’405 D.Del.21-1522 CoreRx D.Del. 10/27/2021 ’023,’405 D. Azurity’sLawsuitsAgainstBionpharma From December 12, 2018 to October 15, 2021, Azurity filed five lawsuits against Bion- pharma only over Bionpharma’s generic enalapril liquid. Collectively, these lawsuits involve all

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Azurity Pharmaceuticals, Inc. v. Bionpharma Inc., (D. Del. 2023).

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