Otsuka Pharmaceutical Co. Ltd. v. Par Pharmaceutical Inc.

Otsuka Pharmaceutical Co. Ltd. initiated a patent infringement lawsuit against Par Pharmaceutical Inc. in the District of Delaware (Case No. 1:13-cv-01979) on November 26, 2013. Otsuka Pharmaceutical, a major Japanese pharmaceutical company, focuses on the research, development, manufacturing, and marketing of innovative pharmaceutical products, particularly in mental, renal, and cardiovascular health areas. Par Pharmaceutical, on the other hand, is a specialty pharmaceutical company dedicated to developing, manufacturing, and distributing a broad line of generic drugs.

The core of the dispute revolves around Par Pharmaceutical's Abbreviated New Drug Application (ANDA) seeking to market a generic version of Otsuka's SAMSCA® (tolvaptan) tablet product, which is used to treat hyponatremia (low blood sodium levels). The primary patent asserted in this litigation is U.S. Patent No. 8,501,730, which broadly claims processes for preparing novel benzazepine compounds and their salts. These compounds serve as intermediates for producing pharmaceutically active 2,3,4,5-tetrahydro-1H-1-benzazepine compounds with vasopressin antagonistic activity, ultimately aimed at achieving high yield and purity on an industrial scale. The litigation was presided over by Judge Richard G. Andrews.

This case represents a typical Hatch-Waxman (ANDA) litigation, a common legal battleground in the pharmaceutical industry to protect proprietary drugs from generic competition. The District of Delaware is a critical venue for such cases, largely because a significant majority of major U.S. technology and pharmaceutical companies are incorporated there. The court is known for its experienced patent bench, making it a preferred forum for complex patent disputes. A notable aspect of this particular case is Par Pharmaceutical's initial premature and improper filing of its Paragraph IV notice, which initially led to a dismissal of related claims, but the infringement action proceeded after a proper filing. Furthermore, recent related litigation (Otsuka Pharmaceutical Co. v. Lupin Ltd., No. 24-2297 (Fed. Cir. May 21, 2026)) involving the same patent and drug affirmed a district court judgment that a generic competitor's tolvaptan ANDA process did not infringe and that asserted method claims were invalid as obvious, suggesting a broader context of generic challenges to Otsuka's tolvaptan patents.

The patent infringement litigation between Otsuka Pharmaceutical Co. Ltd. and Par Pharmaceutical Inc. (1:13-cv-01979) in the District of Delaware involved U.S. Patent No. 8,501,730. The case centered on Par's Abbreviated New Drug Application (ANDA) for a generic version of Otsuka's SAMSCA® (tolvaptan) tablets.

Here's a chronological breakdown of the key legal developments and outcome:

1. Filing & Initial Pleadings (2013-2014):

• 2013-11-26: Otsuka Pharmaceutical Co. Ltd. filed a patent infringement complaint against Par Pharmaceutical Inc. in the District of Delaware. The initial complaint also included U.S. Patent No. 5,753,677, but the focus for this summary is on U.S. Patent No. 8,501,730.
• Otsuka's lawsuit was triggered by Par's "Paragraph IV" certification, indicating that its generic product would not infringe the asserted patents or that the patents were invalid.
• 2013-12-18: Par Pharmaceutical Inc. filed its Answer and Counterclaims (D.I. 7), asserting that the claims of the '730 patent were invalid and/or would not be infringed by its generic tolvaptan tablets.
• A significant early development was Otsuka's argument that Par's initial Paragraph IV notice, sent around October 10, 2013, was "premature and improper" because Par's ANDA had not yet been accepted for filing by the FDA.
• 2014-03-10: The Court granted Otsuka's motion for judgment on the pleadings, finding Par's initial notice letter premature and improper, and dismissed all other claims of all parties without prejudice (D.I. 24).
• 2014-05-05: Par subsequently sent a proper "Second Notice Letter" (received by Otsuka on May 8, 2014) after its ANDA had been accepted by the FDA. This proper notice initiated the infringement action that proceeded in the case.

2. Pre-trial Motions & Claim Construction (2014):

• 2014-12-03: A Markman hearing was held. During the Markman hearing, the Court considered the implication of Par's premature initial filing, noting an advantage Par gained. The Court indicated an intent to push Par's infringement trial to a later date due to this premature filing.

3. Outcome:

• The final disposition of this specific case (1:13-cv-01979) is not explicitly detailed in the provided search results as a distinct trial verdict or final judgment. However, the subsequent related litigation against Lupin Limited regarding the same patent provides strong indications of the trajectory and eventual outcome concerning the '730 patent.
• Parallel PTAB IPR/PGR proceedings & related litigation: U.S. Patent No. 8,501,730 has been challenged in other Hatch-Waxman litigations involving generic versions of tolvaptan.
  • In Otsuka Pharmaceutical Co. v. Lupin Ltd. (1:21-cv-00900-RGA, D. Del., filed 2021-06-23), which involved U.S. Patent No. 8,501,730 and U.S. Patent No. 8,273,735, a bench trial was held from December 18-20, 2023.
  • 2024-07-31: Judge Andrews issued an opinion in the Lupin case, finding that the asserted claims of the '730 patent were not infringed and not invalid. However, the asserted claims of U.S. Patent No. 8,273,735 were found not infringed and invalid for obviousness.
  • 2024-08-07: A Final Judgment was entered in the Lupin case.
  • 2026-05-21: The Federal Circuit, in Otsuka Pharmaceutical Co. v. Lupin Ltd. (No. 24-2297), affirmed Judge Andrews's bench-trial judgment that Lupin's tolvaptan ANDA process did not infringe Otsuka's U.S. Patent Nos. 8,273,735 and 8,501,730. The Federal Circuit also affirmed that the asserted method claims of the '735 patent were invalid as obvious. The opinion in the Lupin case specifically noted that the district court had concluded that the product-by-process claims of the '730 patent were valid.

While the specific conclusion for Otsuka v. Par (1:13-cv-01979) isn't directly stated as a separate trial or settlement, the outcome of the Lupin case, which directly addressed the validity and infringement of the '730 patent, is highly relevant. Given that the Federal Circuit affirmed the non-infringement of the '730 patent against Lupin's ANDA product, it is probable that Par's generic product, if similar, would also be found non-infringing or that a settlement would have been reached in light of these developments. The '730 patent is listed to expire on September 1, 2026.

Otsuka Pharmaceutical Co. Ltd. was represented by counsel from Winston & Strawn LLP and Potter Anderson & Corroon LLP.

Here are some of the identified counsel:

Winston & Strawn LLP (Lead Counsel)

• George C. Lombardi
  • Role: Lead Counsel.
  • Firm Location: Chicago, IL.
  • Experience: A leading patent litigator, recognized for handling complex patent and technology litigations, including cases involving telephone and computer tech. Winston & Strawn's patent litigation practice has been recognized among the busiest law firms for patent litigation and has extensive experience before the Federal Circuit.
• Jovial Wong
  • Role: Lead Counsel.
  • Firm Location: Washington, D.C.
  • Experience: Excels in high-value patent cases related to pharmaceuticals and biotechnology.
• Chuck Klein
  • Role: Lead Counsel.
  • Firm Location: Washington, D.C.
  • Experience: Excels in high-value patent cases related to pharmaceuticals and biotechnology.

Potter Anderson & Corroon LLP (Local Counsel)

• David E. Moore
  • Role: Local Counsel.
  • Firm Location: Wilmington, DE.
  • Experience: Practices as both lead and local counsel in state and federal courts, with substantial experience in patent infringement cases, including Hatch-Waxman litigation. Potter Anderson is frequently retained as local counsel in complex patent litigation in the District of Delaware and has a strong reputation for intellectual property matters.
• Bindu Palapura
  • Role: Senior Associate, likely acting as local counsel.
  • Firm Location: Wilmington, DE.
  • Experience: Assisted David Moore in patent infringement cases, such as the AVM Technologies, LLC v. Intel Corporation case, where a jury found non-infringement for Intel.

Otsuka Pharmaceutical Co. Ltd. (In-house Counsel)
While specific in-house counsel directly appearing on the docket for this particular case were not explicitly identified in the search results, generally, Otsuka Pharmaceutical has an in-house legal team.

• Karen Gally
  • Role: Vice President & General Counsel, Otsuka America Pharmaceutical, Inc.
  • Experience: Focuses on legal issues related to clinical development, product commercialization, and corporate governance. She also worked as an Associate with Epstein, Becker & Green, representing national healthcare companies in criminal and civil investigations before joining Otsuka in 2003.
• Jennifer McGee
  • Role: Global Chief Compliance Officer.
  • Experience: Prior to joining Otsuka in 2011, she worked as a litigator at a multinational law firm, focusing on defending pharmaceutical and medical device manufacturers.

These individuals and firms were likely involved in representing Otsuka Pharmaceutical Co. Ltd. in this specific patent infringement case.

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The user is asking for the counsel of record representing the defendant, Par Pharmaceutical Inc., in the case Otsuka Pharmaceutical Co. Ltd. v. Par Pharmaceutical Inc. (1:13-cv-01979). I need to identify lead counsel, local counsel, and potentially in-house counsel, along with their firms, office locations, and relevant experience. I will use the provided search queries to find this information from docket entries, firm websites, and legal news sources.Here's an identification of the counsel of record representing Par Pharmaceutical Inc. in Otsuka Pharmaceutical Co. Ltd. v. Par Pharmaceutical Inc. (1:13-cv-01979):

Par Pharmaceutical Inc. was represented by counsel from Haug Partners LLP (formerly Frommer Lawrence & Haug LLP) and Morris Nichols Arsht & Tunnell LLP.

Here are some of the identified counsel:

Haug Partners LLP (Lead Counsel)

• Edward M. Haug
  • Role: Lead Counsel.
  • Firm Location: New York, NY.
  • Experience: A prominent patent litigator with extensive experience in pharmaceutical Hatch-Waxman litigation, including representing generic drug manufacturers in ANDA disputes.
• Ronald S. Laurie
  • Role: Lead Counsel.
  • Firm Location: New York, NY.
  • Experience: Specializes in intellectual property litigation and counseling, particularly in the life sciences sector.
• Porter F. Fleming
  • Role: Lead Counsel.
  • Firm Location: New York, NY.
  • Experience: Focuses on patent litigation, with a strong background in pharmaceutical and biotechnology cases.

Morris Nichols Arsht & Tunnell LLP (Local Counsel)

• Jack B. Blumenfeld
  • Role: Local Counsel.
  • Firm Location: Wilmington, DE.
  • Experience: A highly respected Delaware attorney frequently appearing as local counsel in complex patent litigation in the District of Delaware, particularly in Hatch-Waxman cases.
• Mary B. Graham
  • Role: Local Counsel.
  • Firm Location: Wilmington, DE.
  • Experience: Routinely serves as local counsel in patent infringement actions in the District of Delaware.

Par Pharmaceutical Inc. (In-house Counsel)
While specific in-house counsel directly appearing on the docket for this particular case were not explicitly identified in the search results, generally, Par Pharmaceutical (now a subsidiary of Endo International plc) has an in-house legal team that would oversee such litigation.

• Matthew D. O'Connor
  • Role: Former Senior Vice President, General Counsel & Corporate Secretary at Par Pharmaceutical, Inc. (prior to its acquisition by Endo).
  • Experience: Responsible for legal affairs, including intellectual property strategy and litigation oversight.
• Patrick G. LePore
  • Role: Currently Executive Vice President, General Counsel & Chief Administrative Officer at Endo International plc (parent company of Par Pharmaceutical).
  • Experience: Oversees legal matters for the parent company and its subsidiaries, including intellectual property litigation.