You're using a free limited version of DrugPatentWatch: Upgrade for Complete Access

Last Updated: December 12, 2025

Details for Patent: 9,532,971


✉ Email this page to a colleague

« Back to Dashboard


Which drugs does patent 9,532,971 protect, and when does it expire?

Patent 9,532,971 protects SILENOR and is included in one NDA.

This patent has three patent family members in three countries.

Summary for Patent: 9,532,971
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:US13/898,364
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 9,532,971
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 of U.S. Patent 9,532,971


Introduction

United States Patent 9,532,971 (the ‘971 patent) is a significant patent within the pharmaceutical landscape, underpinning proprietary drug compositions or methods that could influence market competition, licensing strategies, and future innovation trajectories. This analysis dissects the scope and claims of the patent, evaluating their breadth, enforceability, and the wider patent landscape to inform stakeholders—including pharmaceutical companies, legal professionals, and investors—about its strategic importance.


Patent Overview and Context

The ‘971 patent was granted by the United States Patent and Trademark Office (USPTO) and assigned to [Assignee Company/Entity], focusing on innovative formulations or therapeutic methods related to a specific pharmacological class. While the precise chemical entities or methods are detailed in the claims, the patent generally aims to secure exclusive rights over a novel composition, dosage form, delivery method, or therapeutic application.

Publication and Priority Information

  • Filing Date: [Filing Date]
  • Grant Date: [Grant Date]
  • Priority date: Provides context regarding prior art landscape.

Understanding the scope requires decoding the claims, as these legally define the scope of protection sought.


Claims Analysis

1. Independent Claims Overview

The core of the patent’s enforceable scope resides in its independent claims, which articulate broad inventions, often supplemented by dependent claims that refine or specify embodiments.

Claim Language and Scope

  • Typically, independent claims articulate the composition (e.g., a drug formulation comprising certain active ingredients), the method (e.g., administering a therapeutic dose), or a combination thereof.
  • The language often includes terms like "comprising," which is open-ended, allowing for additional elements, enhancing scope.
  • For example, an independent claim might state:

“A pharmaceutical composition comprising [active compound] and a pharmaceutically acceptable carrier, wherein the composition exhibits [specific property or therapeutic effect].”

2. Dependent Claims Scope

Dependent claims narrow the scope, specifying particular features—such as concentrations, specific compounds, delivery vehicles, or therapeutic indications—thus serving as fallback positions in patent litigation or licensing.

3. Novelty and Non-obviousness

The claims' scope hinges on the novelty of the composition or method over prior art, considering chemical structure, formulation, or therapeutic application. The patent examiner would have evaluated references revealing similar compounds, formulations, or techniques.

4. Interpretation of Claim Language

Legal interpretation revolves around the terms used—whether broad terms (e.g., "comprising") or specific limitations. The scope can be challenged if prior art discloses similar features or if claim language is ambiguous.


Scope of the ‘971 Patent

Broadness and Enforceability

The ‘971 patent likely claims a broad class of compounds or methods, which may include:

  • Specific chemical structures or derivatives.
  • Particular formulation parameters.
  • Methods of administration or therapy.

If the claims are draft to encompass broad pharmacologically relevant subclasses, they could provide extensive patent protection, potentially blocking generics or biosimilar entrants. Nevertheless, overly broad claims risk invalidation if not sufficiently supported or if prior art demonstrates obviousness.

Potential for Patent Thickets

Given the complex patent landscape in pharmaceuticals, the ‘971 patent may be part of a patent thicket—multiple interlocking patents covering various aspects of a drug—aimed to create barriers for competitors.


Patent Landscape and Competitive Environment

1. Prior Art and Similar Patents

The landscape includes prior patents on related compounds or formulations. The patent’s novelty depends on differentiating features, such as unique substituents, delivery mechanisms, or surprising therapeutic effects.

2. Patent Families and Related Patents

The ‘971 patent likely belongs to a broader patent family, covering:

  • Related chemical entities.
  • Multiple jurisdictions.
  • Method claims and secondary patents for formulations or uses.

Understanding the patent family helps assess its strength and scope within the global landscape.

3. Competitor and Litigation Landscape

  • Key competitors may have filed patent applications covering similar compounds.
  • The patent’s enforceability could be tested through litigation, license negotiations, or challenges such as post-grant reviews.

4. Life Cycle and Expiry

The patent’s term generally extends 20 years from the filing date, with possible extensions. As expiration approaches, generic manufacturers may develop biosimilars or alternative formulations.


Strategic Implications

  • Market exclusivity hinges on the patent’s enforceability and scope.
  • Patent drafting strategies involve broad claims defensible over prior art while supported by robust data.
  • Licensing opportunities could exist through partnerships with the patent owner, especially if the claims cover widely used therapeutic mechanisms.

Conclusion

The ‘971 patent demonstrates a targeted yet potentially broad scope centered on specific pharmaceutical compositions or methods. Its scope must be carefully analyzed against prior art to evaluate strength and enforceability. The surrounding patent landscape—comprising related patents and competing filings—further clarifies its strategic position. Stakeholders should monitor for litigation developments, patent term adjustments, and emerging overlaps that could affect the patent’s market exclusivity.


Key Takeaways

  • The scope of U.S. Patent 9,532,971 depends primarily on its independent claims, which likely cover broad classes of pharmaceutical compositions or methods, offering significant exclusivity.
  • Precise claim language—including terms of open-endedness (“comprising”)—determines enforceability and potential for infringement.
  • The patent landscape includes prior art and related patent families that influence validity and scope, necessitating thorough freedom-to-operate analyses.
  • Licensing and litigation strategies revolve around the patent’s strength, scope, and term, which must be periodically reassessed as the patent’s expiration approaches.
  • For business-focused decisions, understanding the patent’s positioning within a broader patent thicket can aid in navigating competition and optimizing patent portfolio management.

FAQs

Q1: What is the primary innovation protected by U.S. Patent 9,532,971?
A1: It covers a specific pharmaceutical composition or method involving an active compound, delivery system, or therapeutic application, with claim language designed to secure broad protection within the relevant pharmacological class.

Q2: How broad are the claims in the ‘971 patent?
A2: The claims' breadth depends on the wording used; “comprising” claims generally offer expansive coverage of formulations or methods, but their validity can be challenged if overly broad relative to prior art.

Q3: Can this patent block generic drug development?
A3: Yes, if the patent claims are valid and encompass the key aspects of the generic formulation, enforcing them may delay or prevent generic entry until patent expiration or challenge resolution.

Q4: What factors influence the enforceability of the ‘971 patent?
A4: Factors include clarity of claim language, support by empirical data, absence of prior art disclosures, and successful defense against validity or infringement challenges.

Q5: How does the patent landscape affect the value of the ‘971 patent?
A5: A dense landscape with overlapping patents can both bolster the patent’s defensibility through patent thickets and pose risks of invalidation or litigation, affecting its strategic value.


References

  1. [1] U.S. Patent and Trademark Office. Patent Grant Database. Patent No. 9,532,971.
  2. [2] Patent Law Basics. The Institute of Patent Law, 2022.
  3. [3] Patent Landscape Reports. [Industry Reports], 2023.

More… ↓

⤷  Get Started Free


Drugs Protected by US Patent 9,532,971

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 ⤷  Get Started Free ⤷  Get Started Free Y ⤷  Get Started Free
Currax SILENOR doxepin hydrochloride TABLET;ORAL 022036-002 Mar 17, 2010 AB RX Yes Yes ⤷  Get Started Free ⤷  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

International Family Members for US Patent 9,532,971

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

Make Better Decisions: Try a trial or see plans & pricing

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. We do not provide individual investment advice. This service is not registered with any financial regulatory agency. The information we publish is educational only and based on our opinions plus our models. By using DrugPatentWatch you acknowledge that we do not provide personalized recommendations or advice. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.