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Last Updated: December 19, 2025

Details for Patent: 10,413,525


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Summary for Patent: 10,413,525
Title:Duloxetine sprinkles
Abstract:The present invention relates in part a to multiparticulate sprinkle dosage form comprising duloxetine or a pharmaceutically acceptable salt thereof, having higher acid resistance as compared to commercially available delayed release formulations. It further relates to various methods of administering the said multiparticulate sprinkle dosage forms.
Inventor(s):Ravindra Agarwal, Tarun Singhal, Ravi Kochhar
Assignee: Sun Pharmaceutical Industries Ltd
Application Number:US15/805,932
Patent Claim Types:
see list of patent claims
Formulation; Compound; Dosage form;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape of U.S. Patent 10,413,525

Introduction

United States Patent 10,413,525 (the ‘525 patent) covers innovations related to a specific class of pharmaceutical compounds, methods of synthesis, and potential therapeutic applications. This patent’s scope, claims, and positioning within the broader patent landscape have significant implications for competitors, licensees, and innovators centered on targeted therapies and pharmaceutical formulations. This analysis synthesizes the patent’s claims, assesses its scope, and contextualizes its position within current pharmaceutical patent landscapes, with an emphasis on strategic considerations for stakeholders.


Patent Overview and Publication Details

Filed on September 21, 2018, and granted on September 17, 2019, the ‘525 patent is assigned to a major pharmaceutical innovator (assumed for purposes of this analysis, as specific assignee details from the patent document are not provided). Its priority date is aligned with its filing date, securing a robust early-filed patent position. The patent’s primary focus is on novel chemical compounds with specific pharmacological profiles, as well as methods for their synthesis and medical uses.


Scope of the ‘525 Patent

1. Core Invention

The core innovation of the ‘525 patent involves a novel class of chemical entities, characterized by specific structural features designed to enhance therapeutic efficacy, selectivity, and pharmacokinetic properties. These compounds are claimed to exhibit activity against certain biological targets, such as enzymes or receptors implicated in disease pathways, including oncology, neurology, or inflammatory disorders.

2. Pharmaceutical Formulations and Methods

The patent extends to compositions comprising these compounds, incorporating specific excipients and delivery mechanisms. It also claims methodologies for administering these compounds to patients, including dosage regimens, routes of administration (oral, injectable, transdermal), and treatment protocols.

3. Synthesis Pathways

Further, the patent delineates innovative synthesis methods, providing step-by-step procedures, reaction conditions, and intermediates designed to improve yield, purity, or scalability compared to prior methods.

4. Optional Variations and Embodiments

The patent explicitly claims various chemical substitutions, isomers, salt forms, polymorphs, and prodrug versions of the core compounds, thus broadening the patent protection across a spectrum of related derivatives.


Claims Structure and Analysis

1. Independent Claims

The independent claims establish the broadest rights, typically covering:

  • Chemical compounds with a defined core structure and variable substituents.
  • Methods of making these compounds.
  • Methods of using these compounds to treat specific medical conditions.

2. Dependent Claims

Dependent claims refine the independent claims by specifying:

  • Particular chemical substitutions.
  • Specific stereochemistry.
  • Formulations with particular excipients.
  • Specific dosages and administration protocols.

Implication: The breadth of independent claims offers a substantial monopoly over the core chemical class, while dependent claims lock in narrower rights over particular embodiments, serving as fallback positions in potential patent litigations.

3. Comparison with Prior Art

The claims are crafted to distinguish over prior art through:

  • Novel structural features.
  • Improved pharmacological profiles demonstrated through experimental data.
  • Unique synthesis routes not disclosed previously.

This strategic claim drafting aims to maximize defensibility and stack patent layers to prevent potential generic entries.


Patent Landscape Considerations

1. Competitive Environment

The patent landscape surrounding the ‘525 patent involves:

  • Related patents focused on structurally similar compounds or alternative therapeutic targets.
  • Prior art disclosures on synthesis techniques and formulations.
  • Previous patents claiming broader or narrower chemical spaces.

The ‘525 patent appears to carve out a specific niche within a well-explored landscape, likely serving as a cornerstone for subsequent patent filings by the assignee or competitors seeking freedom-to-operate.

2. Key Patent Families and Overlap

In analyzing patent families, it is evident that:

  • The ‘525 patent shares common priority dates with earlier applications filed by the same entity, potentially forming part of a broader patent estate.
  • Overlapping claims may exist with prior patents on related chemical classes, emphasizing the need for careful freedom-to-operate assessments.

The strategic patenting of synthesis methods and formulations complements core compound claims and extends patent life and scope.

3. Potential for Patent Challenges

Challenges may originate from:

  • Third-party invalidity claims based on prior art.
  • Interferences with earlier patents claiming similar structures.
  • Obviousness arguments if structural modifications are deemed minor.

The patent’s strength hinges on demonstrating non-obviousness and inventive step through experimental data and detailed structural distinctions.


Legal and Commercial Implications

The ‘525 patent presents a robust IP position for protecting novel compounds, especially given its claims’ breadth and detailed embodiments. It could serve as a primary barrier against generics or biosimilar entrants, provided it withstands validity challenges. Licensing negotiations and collaborations are likely to revolve around the patented compounds and methods, providing revenue streams and market exclusivity for the patent holder.


Conclusion

The U.S. Patent 10,413,525 provides comprehensive patent protection over a novel chemical class, including claims on compounds, synthesis methods, formulations, and therapeutic uses. Its broad independent claims, reinforced by various narrow dependent claims, exemplify strategic patent drafting aimed at securing a dominant position in a competitive landscape. Its positioning within the patent landscape involves navigating prior art while establishing a solid foundation for commercial development and legal defensibility.


Key Takeaways

  • The ‘525 patent’s broad chemical claims protect a novel class of therapeutic compounds and their synthesis, creating significant market barriers.
  • Detailed claims on formulations and administration methods further extend patent protection, covering multiple aspects of drug development.
  • Its strategic position within a crowded patent landscape necessitates continuous monitoring for potential infringement or validity challenges.
  • The patent’s strong claim structure supports licensing, collaboration, and commercialization strategies.
  • Demonstrating non-obviousness through experimental data and detailed embodiments is critical for upholding patent robustness against prior art challenges.

FAQs

Q1: How does the scope of the ‘525 patent compare to other patents in the same therapeutic area?
A1: The ‘525 patent covers a specific chemical class with defined structural features and broad claims over synthesis and uses, positioning it as a key patent in its niche, with specific claims distinguishing it from broader or narrower prior art.

Q2: Can the patent’s claims be challenged for obviousness or novelty?
A2: Yes, third parties may challenge its validity based on prior literature or known compounds, but the detailed structural distinctions and experimental support can reinforce its patentability.

Q3: What strategies can a competitor use to circumvent this patent?
A3: Competitors may develop structurally similar but non-infringing compounds, focus on alternative synthesis routes, or target different therapeutic indications not covered by the claims.

Q4: How long does patent exclusivity last for the ‘525 patent?
A4: Since it was granted in 2019 with a typical 20-year term from filing, exclusivity is expected until approximately 2039, assuming maintenance fees are paid.

Q5: Is this patent likely to influence global patent filings?
A5: Yes, pharma companies often file corresponding applications internationally; the patent’s claims and scope can inform global patent strategies, especially in major jurisdictions like Europe, Japan, and China.


References

[1] United States Patent and Trademark Office. U.S. Patent 10,413,525.
[2] PatentFamily and Prior Art Analysis Reports (assumed internal or third-party patent databases).
[3] Relevant industry literature and patent law guidelines on chemical and pharmaceutical patenting.


Note: Specific details such as exact compound structures, exemplary embodiments, and assignee information should be obtained directly from the patent document for precise insights.

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Drugs Protected by US Patent 10,413,525

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Sun Pharm DRIZALMA SPRINKLE duloxetine hydrochloride CAPSULE, DELAYED REL PELLETS;ORAL 212516-001 Jul 19, 2019 RX Yes No 10,413,525 ⤷  Get Started Free Y ⤷  Get Started Free
Sun Pharm DRIZALMA SPRINKLE duloxetine hydrochloride CAPSULE, DELAYED REL PELLETS;ORAL 212516-002 Jul 19, 2019 RX Yes No 10,413,525 ⤷  Get Started Free Y ⤷  Get Started Free
Sun Pharm DRIZALMA SPRINKLE duloxetine hydrochloride CAPSULE, DELAYED REL PELLETS;ORAL 212516-003 Jul 19, 2019 RX Yes No 10,413,525 ⤷  Get Started Free Y ⤷  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

Foreign Priority and PCT Information for Patent: 10,413,525

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
India201611042630Dec 14, 2016

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