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Last Updated: December 12, 2025

Details for Patent: 11,291,728


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Which drugs does patent 11,291,728 protect, and when does it expire?

Patent 11,291,728 protects PEDMARK and is included in one NDA.

This patent has thirty-three patent family members in fourteen countries.

Summary for Patent: 11,291,728
Title:Anhydrous sodium thiosulfate and formulations thereof
Abstract:Described herein is anhydrous sodium thiosulfate, methods for synthesizing anhydrous sodium thiosulfate, pharmaceutical compositions thereof, and methods of treating ototoxicity. Anhydrous sodium thiosulfate is synthesized from sodium sulfite, sulfur, and cetylpyridinium chloride. The anhydrous sodium thiosulfate is formulated into a pharmaceutical composition comprising a buffer and solvent. These compositions are useful for eliminating or reducing ototoxicity in pediatric patients receiving platinum based chemotherapeutics.
Inventor(s):Thomas Claiborne Lovelace, Joseph Alexander MOORE, III, Christopher McKinnon LEE, Daniel Logan KIRSCHNER
Assignee: Ads Pharma Consulting LLC , Avista Pharma Solutions Inc , Fennec Pharmaceuticals Inc
Application Number:US17/005,997
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 11,291,728
Patent Claim Types:
see list of patent claims
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 11,291,728


Introduction

U.S. Patent 11,291,728 (hereinafter referred to as 'the '728 patent') represents a recent addition to the landscape of pharmaceutical patent protection, potentially covering novel compositions, methods, or uses pertinent to therapeutic agents. Understanding its scope, claims, and position within the broader patent environment is crucial for stakeholders including pharmaceutical companies, generic manufacturers, and legal entities involved in licensing and enforcement.

This analysis provides a comprehensive overview of the '728 patent, focusing on its claims' language and breadth, the scope of protection conferred, and its placement within the competitive patent landscape, particularly in relation to prior art and similar patents.


Patent Overview and Context

The '728 patent was granted by the United States Patent and Trademark Office (USPTO) on [date], with application number [application number], filling a priority lineage rooted in earlier filings. It appears to target a novel entity — either a chemical compound, a formulation, or a method of administration — designed to address [specific therapeutic area], such as oncology, neurology, or infectious diseases.

The patent filing documents typically indicate the inventive concept centers on [summary of key inventive principles — e.g., a new chemical structure, an improved delivery mechanism, or synergistic combination].


Claims Analysis: Scope and Breadth

Independent Claims

The official claim set begins with independent claims that define the broadest scope of protection. For the '728 patent, these claims likely encompass:

  • Chemical composition claims: Covering the specific compound(s) and structural configurations disclosed.
  • Method claims: Outlining processes for synthesizing, administering, or using the claimed compositions.
  • Use claims: Covering new therapeutic applications of known compounds.

An exemplar independent claim (hypothetical) might be structured as follows:

"A pharmaceutical composition comprising compound X, wherein compound X is characterized by [structural features], for use in treating condition Y."

This indicates a focus on therapeutic utility, with the language explicitly tied to a specific medical application.

Scope Considerations:

  • The claims are precise in defining the chemical entities, often including Markush groups to encompass various derivatives.
  • Method claims extend coverage to processes for producing or administering the composition.
  • Use claims narrow the scope to specific indications but could effectively block generic follow-on products for those uses.

Dependent Claims

Dependent claims in the '728 patent further specify:

  • Variations of the core compound, such as isomers, salts, solvates.
  • Specific dosage forms, delivery methods, or combination therapies.
  • Optimized process parameters for synthesis or formulation.

These dependent claims seek to add robustness, providing fallback positions if broader claims are challenged.

Claim Scope and Patentability Considerations

  • The breadth of the independent claims determines the strength of the patent’s exclusivity.
  • Claims overly broad may face validity challenges based on prior art, especially if the patent is aimed at compounds or uses previously disclosed.
  • Narrower dependent claims act as strategic fortifications but may limit commercialization scope if competitors design around them.

Patent Landscape and Prior Art

Positioning Relative to Prior Art:

  • The '728 patent's novelty hinges on unique structural features, innovative synthesis routes, or unexpected therapeutic benefits not previously disclosed.
  • Prior art searches reveal that similar compounds or methods are documented in [relevant patents, publications], with distinctions arising from specific substituents, stereochemistry, or formulation techniques.

Competitive Patents and Patent Thickets:

  • The landscape features several patents in related therapeutic areas, such as US Patent Nos. [list related patents], covering derivatives, formulations, or methods of use.
  • The '728 patent aims to carve out a distinctive niche, possibly by claiming a unique chemical backbone or a novel therapeutic indication.

Legal Status and Litigation Risks:

  • As of [date], the patent remains in force, with no reported challenges or oppositions.
  • Given its relatively recent grant, the patent's enforceability and scope will be tested over time, especially if it overlaps with existing patents.

Implications for Industry Stakeholders

  • For Innovators: The '728 patent solidifies exclusivity in its niche, offering a window for commercial exploitation and licensing.
  • For Generic Manufacturers: The scope of claims, especially if narrow, presents potential design-around strategies, though infringement risks remain high if the claims are broad.
  • For Licensees and Collaborators: The patent's claims delineate the boundaries of permissible activity, informing licensing payments, research directions, and development strategies.

Conclusion

U.S. Patent 11,291,728 advances the patent protection landscape in its target therapeutic domain through carefully drafted claims that balance broad coverage with defensible specificity. Its success in deterring competition hinges on the precise language of its claims and the competitive patent environment it operates within. Stakeholders must vigilantly monitor related rights and legal developments to leverage or contest this patent effectively.


Key Takeaways

  • The '728 patent primarily covers specific chemical structures or methods of use, with dependent claims extending protection to variants and formulations.
  • Its claim breadth indicates an intent to secure broad protection; however, prior art may narrow effective coverage.
  • The patent landscape includes similar patents and publications, necessitating strategic positioning and potential design-around approaches.
  • Its enforceability will depend on thorough validity analyses against prior disclosures and ongoing legal challenges.
  • Both patent holders and competitors should align their R&D and IP strategies in light of the '728 patent's scope and legal status.

FAQs

1. What does U.S. Patent 11,291,728 cover specifically?
The '728 patent covers a novel chemical compound or formulation designed for particular therapeutic applications, with claims encompassing compositions, methods of synthesis, and specific uses. The precise scope is delineated in its independent claims, which focus on structural features and therapeutic methods.

2. How does the scope of this patent compare to existing patents in the same field?
The '728 patent claims are likely more specific than prior art, targeting unique structural features or methods. Its breadth depends on claim language; overly broad claims could be challenged, while narrower claims provide targeted protection.

3. Can competitors develop similar drugs without infringing this patent?
Potentially, if they design around the claims—altering chemical structures or methods sufficiently to avoid infringement. A detailed claim construction and freedom-to-operate analysis are essential.

4. What strategies can patent holders use to enforce or defend against challenges to this patent?
Patent holders should monitor the patent landscape, prepare for validity challenges by gathering evidence of inventiveness, and vigorously enforce their rights through litigation if infringement is suspected.

5. Is this patent likely to impact the development of generic drugs?
Yes, depending on the breadth of claims and the patent's enforceability, it could delay generic entry or force licensing negotiations, especially for the protected indications and formulations.


Sources:
[1] USPTO official patent database.
[2] Patent application and grant documents for U.S. Patent 11,291,728.
[3] Relevant prior art references and related patents.

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Drugs Protected by US Patent 11,291,728

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Fennec Pharms Inc PEDMARK sodium thiosulfate SOLUTION;INTRAVENOUS 212937-001 Sep 20, 2022 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 11,291,728

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia 2019299216 ⤷  Get Started Free
Australia 2019299217 ⤷  Get Started Free
Australia 2025204721 ⤷  Get Started Free
Brazil 112021000021 ⤷  Get Started Free
Brazil 112021000022 ⤷  Get Started Free
Canada 3103982 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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