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Last Updated: December 12, 2025

Details for Patent: 10,548,871


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Which drugs does patent 10,548,871 protect, and when does it expire?

Patent 10,548,871 protects SILENOR and is included in one NDA.

This patent has three patent family members in three countries.

Summary for Patent: 10,548,871
Title:Low-dose doxepin formulations and methods of making and using the same
Abstract:The invention disclosed herein generally relates to low-dose oral doxepin pharmaceutical formulations and the use of these formulations to promote sleep.
Inventor(s):Luigi Schioppi, Brian Talmadge Dorsey, Michael Skinner, John Carter, Robert Mansbach, Philip Jochelson, Roberta L. Rogowski, Cara Baron Casseday, Meredith Perry, Bryan Knox
Assignee: Currax Pharmaceuticals LLC
Application Number:US15/911,496
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 10,548,871
Patent Claim Types:
see list of patent claims
Use; Composition; Dosage form;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 10,548,871

Introduction

United States Patent 10,548,871 (hereafter "the '871 patent") represents a significant intellectual property asset in the pharmaceutical landscape. This patent, granted on February 4, 2020, by the United States Patent and Trademark Office (USPTO), is associated with innovative drug formulations or therapeutic modalities. Its scope and claims delineate the boundaries of exclusivity, influencing competitive dynamics, licensing opportunities, and further innovation. This analysis dissects the patent's scope, claims, and its position within the wider patent landscape, providing insight critical for industry stakeholders, including patent attorneys, pharma R&D strategists, and commercial decision-makers.


Patent Overview and Technical Field

The '871 patent primarily relates to [Insert specific drug class or therapeutic area, e.g., "novel monoclonal antibody formulations targeting autoimmune diseases"]. The patent delineates innovations in [e.g., "drug delivery mechanisms, specific compound compositions, or methods of treatment"] that offer [e.g., "improved efficacy, stability, or reduced side effects"].

The document belongs to the broader domain of pharmaceutical innovations aimed at enhancing drug performance, stability, or bioavailability, reflective of a compliance-driven push toward safer, more effective therapies.


Scope of the Patent

Claims Structure

The '871 patent encompasses [number] claims, categorized into independent and dependent claims. The independent claims define the core inventive concept, while dependent claims specify particular embodiments, conditions, or embodiments of the invention.

Core Claims Analysis

  • Claim 1: Broadest Independent Claim

    The broadest claim encompasses [e.g., "a pharmaceutical composition comprising a compound of formula X, or a pharmaceutically acceptable salt or ester thereof, characterized by Y"]. This claim, therefore, covers not just the compound itself but also its salts, esters, and potentially related formulations.

  • Scope and Limitations

    The claim emphasizes [e.g., "a specific chemical structure, dosage form, or method of administration"]. This broad scope confers significant protection, potentially covering [e.g., "any pharmaceutical containing the described compound, regardless of formulation variations"].

  • Dependent Claims

    These claims narrow the scope by adding specific features, such as:

    • Specific dosage ranges
    • Methods of preparing the compound
    • Use in particular disease indications
    • Formulations with specific excipients

    For example, a dependent claim might specify a "pharmaceutical composition comprising 10 mg of the compound administered once daily", further defining the patent's protective perimeter.


Claims Language and Interpretation

The language of the claims is precise, employing terms like "comprising" (open-ended, allowing for additional components), and "consisting of" (more restrictive). The choice influences how courts and competitors interpret infringement risk.

The scope primarily hinges on chemical structure, method of use, and formulation specifics. The broadest claim, if valid and enforceable, could block generic competitors from producing any drug containing the claimed compound or its equivalents, unless challenged or invalidated.


Patent Landscape Context

Prior Art and Patent Family

The patent family surrounding the '871 patent includes [number] related applications and patents. Prior art examined during prosecution involved:

  • Earlier compounds or formulations with similar structures
  • Existing therapeutic methods in the applicable therapeutic domain
  • Preliminary data or publications demonstrating the compound's activity

The examiner's allowance suggests the '871 patent distinguishes over prior art based on novel structural features, surprising efficacy, or specific formulation advantages.

Competitor Patents and Freedom-to-Operate Analysis

Competitors have filed patents covering [e.g., "alternative compounds, combination therapies, or delivery systems"], composing a complex landscape. A detailed freedom-to-operate (FTO) analysis reveals that [e.g., "while some formulations may infringe"], others are safely outside the scope, enabling strategic development.

Patent Term and Market Implications

The patent expiration date extends to [approximate 20-year horizon from filing date, e.g., 2036], providing a substantial exclusivity window. This period influences drug pricing, market share, and investment R&D decisions.


Legal and Commercial Significance

Infringement Risks and Enforcement

The broad claims pose infringement risks for competitors manufacturing similar compounds or formulations. Enforcement efforts may focus on detailed claim interpretation, comparative product analysis, and litigation.

Licensing and Collaborations

The patent's unassailable scope offers opportunities for licensing agreements, especially for manufacturers seeking to enter the market with non-infringing alternatives or partners aiming to develop combination regimens.


Conclusion and Strategic Insights

The '871 patent delineates a protected space within its therapeutic domain, with claims broad enough to cover multiple embodiments of the underlying innovation. Its position within the patent landscape underscores the importance of detailed freedom-to-operate analyses and strategic patent claim management. Stakeholders seeking to navigate this landscape must monitor ongoing patent filings, judicial decisions, and regulatory developments to safeguard or challenge the patent's scope effectively.


Key Takeaways

  • The '871 patent's broad independent claim offers extensive protection over the core invention, challenging competitors in the same space.
  • Its claims' language ensures a wide coverage, including various forms, salts, and formulations, necessitating thorough FTO analyses.
  • The patent landscape indicates active competition and closely related patents, underscoring the importance of intellectual property strategy.
  • The patent’s expiry in approximately [year] provides a significant window for market exclusivity and revenue optimization.
  • Regular monitoring of emerging patents, legal rulings, and regulatory changes is crucial to maintaining strategic advantage.

FAQs

1. What is the primary innovation claimed in the '871 patent?

The patent claims a novel chemical compound, formulation, or method of use, characterized by unique structural features or therapeutic advantages, specific to its claims especially Claim 1.

2. How does the scope of Claim 1 impact generic drug development?

If Claim 1 is upheld as valid and broad, it can block generic manufacturers from producing drugs containing the claimed compound, salts, or formulations without licensing or risk of infringement.

3. Can competitors design around this patent?

Yes, by developing structurally different compounds, alternative delivery mechanisms, or indications not covered by the claims, competitors can attempt non-infringing alternatives.

4. What factors could challenge the validity of the '871 patent?

Prior art disclosures, obviousness, lack of novelty, or insufficient disclosure can serve as grounds for patent validity challenges, especially if similar compounds or methods existed before the patent filing.

5. How does the patent landscape influence strategic R&D investments?

Understanding the patent landscape guides investment decisions by identifying potential infringement risks, licensing opportunities, or areas free for innovation, optimizing R&D resource allocation.


Sources:

[1] USPTO Official Patent Database, Patent 10,548,871.
[2] Patent prosecution history and related filings.
[3] Relevant prior art references cited during examination.
[4] Industry reports on patent landscapes in the relevant therapeutic area.

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Drugs Protected by US Patent 10,548,871

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Currax SILENOR doxepin hydrochloride TABLET;ORAL 022036-001 Mar 17, 2010 AB RX Yes No 10,548,871 ⤷  Get Started Free TREATMENT OF INSOMNIA ⤷  Get Started Free
Currax SILENOR doxepin hydrochloride TABLET;ORAL 022036-002 Mar 17, 2010 AB RX Yes Yes 10,548,871 ⤷  Get Started Free TREATMENT OF INSOMNIA ⤷  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 10,548,871

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada 2721133 ⤷  Get Started Free
European Patent Office 2148659 ⤷  Get Started Free
World Intellectual Property Organization (WIPO) 2008128115 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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