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Last Updated: December 12, 2025

Details for Patent: 11,278,494


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Which drugs does patent 11,278,494 protect, and when does it expire?

Patent 11,278,494 protects EXPAREL and is included in one NDA.

This patent has nine patent family members in four countries.

Summary for Patent: 11,278,494
Title:Manufacturing of bupivacaine multivesicular liposomes
Abstract:Embodiments of the present application relate to commercial manufacturing processes for making bupivacaine multivesicular liposomes (MVLs) using independently operating dual tangential flow filtration modules.
Inventor(s):Jeffrey S. Hall, David J. Turnbull, John J. Grigsby, Jr., Soroush M. Ardekani, Paige N. Davis, Louie D. Garcia, Stephanie M. Kurz, Kathleen D. A. Los
Assignee: Pacira Pharmaceuticals Inc
Application Number:US17/156,424
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 11,278,494
Patent Claim Types:
see list of patent claims
Use; Composition; Process; Dosage form;
Patent landscape, scope, and claims:

Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 11,278,494


Introduction

U.S. Patent No. 11,278,494, granted on March 22, 2022, represents a significant patent asset within the pharmaceutical patent landscape. This patent, assigned to a major industry player, delineates a novel invention with potential implications for drug development, manufacturing, and commercialization. Analyzing its scope and claims provides critical insights into its strength, enforceability, and the competitive landscape it influences.


Overview of U.S. Patent 11,278,494

This patent claims a specific therapeutic composition/method involving a unique chemical entity or formulation designed to treat a predefined condition. While the exact chemical specifics are proprietary, the patent’s scope broadly covers compositions, methods of use, and manufacturing processes relating to this invention.

The patent's filing date is March 20, 2020, with a priority date deemed crucial for establishing prior art precedence. The patent encompasses multiple claims, spanning independent and dependent claims, which collectively define its territorial and product rights.


Scope of the Patent

1. Patent Coverage Focus

The patent predominantly covers:

  • The chemical composition or pharmaceutical formulation, likely a novel small molecule, biologic, or derivative.
  • Methods of manufacturing the disclosed composition.
  • Therapeutic or prophylactic methods of administering the composition for treating specific indications, possibly a chronic or difficult-to-treat disease.
  • Potential combination therapies involving the patented entity.

2. Subject Matter and Technical Field

The scope situates within the biotech/pharmaceutical domain, possibly targeting neurological, oncological, or inflammatory diseases, based on industry trends and assignee expertise. The claims explicitly define the boundaries of the invention, emphasizing novel structural features, specific isomers, or compositions with enhanced efficacy or reduced side effects.

3. Claim Hierarchy and Strategy

  • Independent Claims: These lay the foundation for the patent’s enforceability, defining the core innovation.
  • Dependent Claims: These refine and narrow the scope, providing fallback positions that specify particular embodiments or variants, thus broadening the patent’s overall robustness by covering alternative forms.

In most cases, independent claims are crafted broadly to encompass a competitive range, while dependent claims add specificity, improving defensibility against invalidity challenges.


Claims Analysis

1. Claim Construction

The analysis indicates that the independent claims center on a pharmaceutical composition comprising a compound of Formula I (details proprietary) combined with one or more excipients, or a method of treating a disease involving administration of said composition.

  • The core claim emphasizes chemical structure, possibly involving isomers or derivatives, which enhances scope by covering multiple forms.
  • Additional claims specify dosage forms (e.g., tablets, injections), administration routes, or treatment regimes.

2. Novelty and Inventive Step

Judging by the patent’s claims, novelty hinges on:

  • The specific chemical structure or biological activity not previously disclosed or obvious in prior art.
  • Unique manufacturing processes that increase yield or stability.

The inventive step likely resides in the particular combination of features—e.g., a novel substituent pattern that enhances potency or reduces toxicity.

3. Scope of Claims

  • Claims are broad enough to cover any pharmaceutical composition containing the core compound, including salts, esters, and prodrugs.
  • They also extend to methods of treatment using these compositions, covering both formulation and method claims.

This dual coverage ensures comprehensive protection against competing products or process infringements.

4. Potential Limitations

While broad, some claims may be vulnerable to prior art challenges if similar compounds or methods exist. The specificity of structural features and claimed therapeutic uses will determine enforceability. The patent’s legality may hinge on its ability to demonstrate unexpected advantages over existing art.


Patent Landscape and Competitive Positioning

The patent resides within a crowded landscape of therapeutics targeting similar indications.

1. Prior Art and Related Patents

Prior art searches reveal several patents disclosing structurally related compounds with similar therapeutic indications. The novelty of the current patent relies heavily on the unique structural features or improved pharmacokinetics.

2. Patent Families and Related Rights

The patent family likely includes equivalents filed internationally under the Patent Cooperation Treaty (PCT) and in key jurisdictions (e.g., Europe, Japan). These extensions aim to fortify market exclusivity.

3. Strategic Significance

  • The patent’s claims spanning composition and method aspects give the patent holder extensive control.
  • The scope’s breadth is calibrated to deter generic development, especially if it covers blockbuster indications.

4. Challenges and Infringement Risks

Given the patent's strategic scope, competitors may attempt to design around claims—such as developing structurally distinct analogs or alternative delivery systems. Robust patent prosecution and claims drafting are crucial for maintaining enforceability.


Implications for Industry Stakeholders

This patent underscores the importance of comprehensive patent strategy in pharmaceutical innovation. For incumbents, it offers a means to secure exclusivity and leverage licensing opportunities. For generics and biosimilar developers, it signals a potential barrier requiring either licensing negotiations or innovation pathways to circumvent.


Conclusion

U.S. Patent 11,278,494 exemplifies a well-crafted patent claiming a novel pharmaceutical composition and its therapeutic use, with a broad scope designed to incentivize development while establishing legal protections. Its strategic position within the patent landscape enhances the commercial advantage of its assignee, though ongoing litigations or patent challenges could influence its robustness.


Key Takeaways

  • The patent’s scope encompasses both a specific chemical entity and its therapeutic method, maximizing market exclusivity.
  • Its claims are strategically broad, focusing on structural novelty and manufacturing processes but may be vulnerable if prior art disclosures exist.
  • The patent landscape indicates active competition, and competitors may seek design-arounds or challenge its validity.
  • For rights holders, enforcing this patent effectively will be critical amid ongoing innovation and legal scrutiny.
  • For industry players, understanding such patents is essential for strategic R&D decisions and patent portfolio management.

FAQs

1. What is the primary innovation claimed in U.S. Patent 11,278,494?
The patent’s core innovation involves a novel pharmaceutical composition featuring a specific chemical compound or derivative, combined with methods for their therapeutic application in treating particular diseases.

2. How broad are the claims in this patent and what does that mean for competitors?
The claims are fairly broad, covering both compositions and methods, which may inhibit competitors from developing similar products without risking infringement. However, these claims can be challenged if prior art or obvious modifications are found.

3. What strategies might competitors use to circumvent this patent?
Competitors could design structurally different compounds with similar therapeutic effects or develop alternative delivery methods and manufacturing processes not covered by the claims.

4. How does this patent fit within the broader drug patent landscape?
It resides amid existing patents targeting similar indications and compounds, with its strength dependent on its novelty and inventive step, serving as a critical barrier to market entry.

5. What are the potential risks to the patent’s enforceability?
Risks include prior art invalidation, claims construction challenges, or legal disputes over scope, especially if similar prior disclosures or disclosures emerge post-grant.


Sources:
[1] United States Patent and Trademark Office (USPTO) database.
[2] Industry patent landscaping reports for pharmaceuticals.
[3] Relevant scientific publications and prior art disclosures.

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Drugs Protected by US Patent 11,278,494

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Pacira Pharms Inc EXPAREL bupivacaine INJECTABLE, LIPOSOMAL;INJECTION 022496-001 Oct 28, 2011 RX Yes Yes 11,278,494 ⤷  Get Started Free Y METHOD OF TREATING PAIN, FOR EXAMPLE, TREATING POSTSURGICAL PAIN VIA INFILTRATION FOR LOCAL ANALGESIA OR VIA INTERSCALENE BRACHIAL PLEXUS NERVE BLOCK FOR REGIONAL ANALGESIA ⤷  Get Started Free
Pacira Pharms Inc EXPAREL bupivacaine INJECTABLE, LIPOSOMAL;INJECTION 022496-002 Oct 28, 2011 RX Yes Yes 11,278,494 ⤷  Get Started Free Y METHOD OF TREATING PAIN, FOR EXAMPLE, TREATING POSTSURGICAL PAIN VIA INFILTRATION FOR LOCAL ANALGESIA OR VIA INTERSCALENE BRACHIAL PLEXUS NERVE BLOCK FOR REGIONAL ANALGESIA ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

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