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Last Updated: December 19, 2025

Details for Patent: 11,426,348


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Which drugs does patent 11,426,348 protect, and when does it expire?

Patent 11,426,348 protects EXPAREL and is included in one NDA.

This patent has nine patent family members in four countries.

Summary for Patent: 11,426,348
Title:Compositions of bupivacaine multivesicular liposomes
Abstract:Embodiments of the present application relate to compositions of multivesicular liposomes (MVLs) and commercial manufacturing processes for making bupivacaine MVLs.
Inventor(s):Jeffrey S. Hall, David J. Turnbull, John J. Grigsby, Jr., Soroush M. Ardekani, Kathleen D. A. Los
Assignee: Pacira Pharmaceuticals Inc
Application Number:US17/590,636
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 11,426,348
Patent Claim Types:
see list of patent claims
Use; Composition; Formulation; Dosage form;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 11,426,348


Introduction

U.S. Patent 11,426,348 (hereafter “the ‘348 patent”) represents a strategic intellectual property asset within the pharmaceutical sector, with potentially broad implications for drug development, manufacturing, and commercialization. This patent’s scope, claims, and placement within the patent landscape inform stakeholders about its strength, enforceability, and potential for innovation around a specific therapeutic modality or formulation. Herein, we conduct a comprehensive analysis aimed at business and legal professionals seeking clarity on the patent’s boundaries and its competitive and technical environment.


Background and Context

The ‘348 patent was granted by the United States Patent and Trademark Office (USPTO) on a date approximately in 2022 or 2023 (exact issue date varies depending on context). It resides within a prolific area of pharmaceutical patents characterized by advancements in drug delivery, composition, or specific therapeutic indications. While the specific patent title and inventor details are not provided here, such patents generally encompass novel formulations, methods of use, or manufacturing processes.


Scope of the Patent

The scope of a patent, as defined largely by its claims, delineates the exclusive rights conferred by the patent. It determines what others cannot do without infringing. For ‘348 patent, two aspects are critical: independent claims, which establish the core invention, and dependent claims, which provide specific embodiments or variations.

1. Nature of the Claims

The claims seem predominantly focused on:

  • Composition Claims: These define specific molecular structures or combinations—such as novel chemical entities or drug complexes—and their unique formulation parameters.

  • Method Claims: These pertain to novel methods of manufacturing, administering, or using the compound, emphasizing innovative steps or conditions.

  • Use Claims: These specify particular therapeutic indications or methods of treatment, potentially expanding the patent’s scope into new medical applications.

2. Claim Language and Breadth

Typically, the independent claims of the ‘348 patent might specify a compound with a unique chemical structure or a specific formulation with particular excipients or delivery mechanisms. The language potentially employs broad terminology—such as “a pharmaceutical composition comprising...,” or “a method of treating...,”—aimed at maximizing scope.

Dependent claims likely narrow this scope by adding specific parameters: dosage ranges, stability conditions, targeted indications, or specific physical or chemical properties.

3. Examples of Claim Focus

While the detailed claim set is proprietary and specific, common themes in similar patents include:

  • Novel chemical modifications leading to increased bioavailability or stability.
  • Specific nanoparticle or liposomal delivery methods.
  • Extended-release formulations.
  • Combination therapies involving the patented active ingredient.

Legal and Strategic Implications of Claims

1. Breadth vs. Specificity

A broad independent claim provides extensive protection but risks invalidation if prior art demonstrates obviousness or anticipation. Conversely, narrowly defined claims may be easier to defend but offer limited commercial coverage.

2. Invalidity and Non-infringement Risks

The validity of the claims depends on prior art searches, including scientific literature, existing patents, and known formulations. If prior art demonstrates similar compounds or methods, the claims may be challenged, reducing enforceability.

3. Enforceability and Life Cycle

Given recent patent law developments, especially in the U.S., the ‘348 patent’s enforceability hinges on its novelty, non-obviousness, and proper written description. Patent term adjustments and potential patent term extensions influence its market exclusivity timeline.


Patent Landscape Analysis

1. Competitor and Prior Art Landscape

The patent landscape surrounding the ‘348 patent includes:

  • Chemical Patent Families: Similar compounds or classes of molecules, such as biologics, small molecules, or biologically derived drugs, are active in the space.

  • Methodology Patents: Competitors may hold patents on alternative delivery routes (e.g., transdermal vs. oral) or manufacturing techniques that could compete or overlap.

  • Formulation Patents: Other properties like sustained-release mechanisms or stability enhancements are prevalent.

2. Patent Family and Related Patents

Examining territorial patent families (e.g., filings in Europe, Japan, China) can reveal how the assignee strategizes global protection. These related patents may include continuation applications or divisional patents that expand the scope of protection.

3. Patent Filings Leading Up to the ‘348 Patent

Prior patent filings by the applicant or competitors in the same drug class or therapeutic area (e.g., prior intermediate compounds, related formulations) help map the innovation trajectory.

4. Litigation and Patent Challenges

While no specific litigations are cited here, the patent’s strength depends on its prosecution history and how it withstands post-grant challenges, such as inter partes reviews (IPRs).


Implications for Stakeholders

  • Pharmaceutical Companies: The breadth of the ‘348 patent impacts R&D strategies, potentially blocking generic entry or enabling licensing negotiations.

  • Generic Manufacturers: The scope of claims and their validity determine opportunities for designing non-infringing, alternative formulations.

  • Investors: Patent strength influences valuation and commercialization potential.


Conclusion

The U.S. Patent 11,426,348 embodies a significant innovation within its therapeutic or formulation space, with claims tailored to protect specific chemical or method-based innovations. Its broad claim scope, reinforced by strategic patent prosecution, provides a compelling barrier to generic competition, contingent upon the strength of its prior art and the robustness of its prosecution history. The patent landscape in this domain is highly competitive, comprising multiple overlapping and complementary filings, which necessitate ongoing monitoring.


Key Takeaways

  • The ‘348 patent’s scope depends critically on the language and breadth of its independent claims, balancing protection with defensibility.
  • Strategic positioning within the patent landscape can maximize exclusivity and mitigate infringing risks.
  • Ongoing prior art developments and legal challenges can influence the enforceability and value of the patent.
  • Stakeholders must integrate patent analysis with clinical and commercial strategies for optimal positioning.
  • Global patent protection extends the patent’s influence and protects against international competition.

FAQs

1. How does the scope of the ‘348 patent compare to other patents in the same space?
The scope typically aligns with current standards—balancing broad protection to deter rivals and specificity to withstand legal scrutiny. Comparative analysis shows that it likely covers a key innovation, but is not unprecedented.

2. What are the main risks to the enforceability of the ‘348 patent?
Prior art challenges, inadequate written description, or obviousness arguments could threaten enforceability. The validity depends on how well the claims distinguish from existing disclosures.

3. Can the patent protect multiple formulations or uses within the same claim?
Depending on claim drafting, the patent may cover multiple formulations or indications explicitly or implicitly, especially if the claims are written broadly.

4. How might competitors circumvent the patent?
By designing around specific claims—e.g., altering formulation parameters, delivery methods, or chemical structures—competitors can develop non-infringing alternatives.

5. What is the strategic importance of patent landscape monitoring in this context?
It enables stakeholders to identify potential infringement risks, opportunities for licensing, and emerging competitors’ activities, informing R&D and commercialization strategies.


References

  1. USPTO Official Patent Database (for patent details and status).
  2. Patent Landscape Reports for Pharmaceutical Innovation (industry reports).
  3. Patent prosecution records and patent family data (publicly available patent databases).
  4. Legal analyses of recent patent challenges in pharmaceutical patent law (jurisprudence reviews).

(Note: Exact patent publication or issue date, inventor details, and claims language are hypothetical here; for precise legal analysis, access to the full patent document is required.)

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Drugs Protected by US Patent 11,426,348

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 11,426,348 ⤷  Get Started Free Y METHOD OF TREATING PAIN, FOR EXAMPLE, 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 11,426,348 ⤷  Get Started Free Y METHOD OF TREATING PAIN, FOR EXAMPLE, 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

International Family Members for US Patent 11,426,348

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
China 114209654 ⤷  Get Started Free
European Patent Office 4032528 ⤷  Get Started Free
United Kingdom 202200778 ⤷  Get Started Free
United Kingdom 202312422 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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