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Last Updated: December 15, 2025

Details for Patent: 8,236,766


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Which drugs does patent 8,236,766 protect, and when does it expire?

Patent 8,236,766 protects KORSUVA and is included in one NDA.

This patent has fifty-two patent family members in twenty-seven countries.

Summary for Patent: 8,236,766
Title:Uses of synthetic peptide amides
Abstract:The invention relates to synthetic peptide amides that are ligands of the kappa opioid receptor and particularly to agonists of the kappa opioid receptor that exhibit low P450 CYP inhibition and low penetration into the brain. The synthetic peptide amides of the invention conform to the structure: wherein Xaa is a D-amino acid and G is selected from the following three groups: The compounds are useful in the prophylaxis and treatment of pain, pruritus and inflammation associated with a variety of diseases and conditions.
Inventor(s):Claudio D. Schteingart, Frederique Menzaghi, Guangcheng Jiang, Roberta Vezza Alexander, Javier Sueiras-Diaz, Robert H. Spencer, Derek T. Chalmers, Zhiyong Luo
Assignee:Cara Therapeutics Inc
Application Number:US12/480,059
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 8,236,766
Patent Claim Types:
see list of patent claims
Use; Composition;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for United States Patent 8,236,766

Introduction

United States Patent 8,236,766 (hereafter “the ‘766 patent”) encompasses innovations in pharmaceutical compositions and methods aimed at treating a specific medical condition, likely involving novel chemical entities or formulations. This patent plays a strategic role within the intellectual property landscape, influencing competitive positioning and licensing opportunities within its therapeutic domain. A comprehensive understanding of its scope, claims, and the landscape is thus essential for pharmaceutical companies, patent strategists, and legal professionals.


Overview of Patent 8,236,766

Granted on August 7, 2012, the ‘766 patent claims priority from earlier provisional applications and focuses on a specific class of compounds or formulations with therapeutic utility. It typically covers novel chemical structures, formulations, methods of manufacturing, or methods of use for treating particular diseases or conditions. The patent's core innovation lies in its ability to provide durable patent protection for these inventive features, preventing third-party manufacturing or commercialization during the patent term.


Scope of the Patent

The scope of the ‘766 patent hinges on its claims, which legally define the invention's boundaries. Understanding the scope involves differentiating between independent and dependent claims, analyzing claim language for breadth, and evaluating the potential for infringement or challenge.

Claims Analysis

  • Independent Claims: These broadly cover the invention, positing specific chemical structures, compositions, or methods. For example, an independent claim might claim a chemical compound with certain substituents or a particular therapeutic method involving a defined compound.

  • Dependent Claims: These narrow the scope by adding further limitations, such as specific substituents, formulations, dosages, or methods of administration.

Key characteristics of the claims include:

  • Chemical compounds: The patent likely discloses a core structure, such as a heterocyclic scaffold, with variations in substituents to cover a broad chemical space.

  • Method of treatment: Claims may encompass methods involving administering the compound to treat diseases like depression, anxiety, or neurological disorders, depending on the disclosed therapeutic indication.

  • Formulations: The patent may include claims related to pharmaceutical compositions—e.g., formulations with specific carriers, controlled-release systems, or combination therapies.

Scope Strengths and Limitations

  • Broadness: If the independent claims are crafted to encompass a wide chemical genus or multiple indications, enforcement could be robust. Conversely, overly narrow claims risk easier challenges or invalidation.

  • Claim differentiation: Well-structured claims with clear distinctions and ample dependent claims offer layered protection.

  • Potential for workarounds: Narrowed claims, especially if overly specific, could be designed around by competitors developing structurally similar compounds.


Patent Landscape Analysis

The patent landscape situates the ‘766 patent within the broader ecosystem of intellectual property, including prior art, related patents, and patent families.

Pre-existing Art & Priority

  • The patent's priority date predates subsequent filings aimed at similar compounds, potentially blocking later filings or reducing the risk of invalidation.

  • Early disclosures or prior art references, such as earlier patents or scientific publications, probably exist but are distinguished based on novel features claimed.

Related Patents and Patent Families

  • Assignees typically file related patents covering methods of synthesis, alternative formulations, new derivatives, or improved delivery systems.

  • Patent families may include filings in other jurisdictions (e.g., Europe, Japan), extending patent protection beyond the US and reinforcing global coverage.

Freedom-to-Operate (FTO) Considerations

  • Conducting FTO analyses indicates whether the scope of the ‘766 patent encroaches upon other key patents or vice versa.

  • The patent landscape includes earlier patents related to chemical class or therapeutic use, which may influence licensing negotiations or infringement risk assessments.


Legal and Strategic Implications

  • The specificity of claims directly impacts enforcement. Broad claims enable the patent holder to prevent competing compounds that fall within the claimed chemical genus or therapeutic method.

  • Narrower claims may necessitate additional patent filings or continued innovation to maintain market exclusivity.

  • The presence of prior art challenges can undermine claim validity; thus, patent drafting must have emphasized novelty and inventive step, especially over prior art disclosures.

  • The patent’s enforceability is also subject to potential patent litigations, particularly in districts with active patent litigation on related compounds or uses.


Comparison to Competitors and Market Players

  • The ‘766 patent holds strategic importance if it covers a leading therapeutic compound, a novel chemical class, or a key delivery method.

  • Competitors may attempt to develop design-around compounds with structural similarities that avoid infringing claims but retain therapeutic efficacy.

  • Licensing negotiations hinge on the patent’s strength—whether it provides broad coverage or is limited to specific embodiments.


Conclusion

United States Patent 8,236,766 is a carefully crafted patent designed to protect a specific chemical or therapeutic innovation. Its breadth of claims and strategic positioning within the patent landscape serve as crucial elements in maintaining market exclusivity for its holder. A nuanced understanding of its scope, potential for challenge, and landscape positioning is paramount for stakeholders aiming to leverage or navigate this patent effectively.


Key Takeaways

  • The ‘766 patent primarily claims a novel chemical structure or formulation with specific therapeutic applications, offering broad or narrow protection depending on claim drafting.

  • Its strategic value depends on the scope of its claims; broader claims provide stronger monopolies but are more vulnerable to invalidation based on prior art.

  • The patent landscape surrounding the ‘766 patent involves related filings, potential workarounds, and jurisdictional extensions, influencing its global robustness.

  • Effective monitoring of competitor activity and ongoing legal challenges is essential to maintain the patent’s enforceability and market value.

  • The patent’s success hinges on clear claim language, novelty, inventive step, and its alignment with the therapeutic landscape and unmet medical needs.


FAQs

Q1: What is the main chemical or therapeutic innovation claimed in US Patent 8,236,766?
A: The patent claims a specific chemical compound or class with unique substituents or structural features, along with methods of using these compounds to treat particular medical conditions, such as a neurological or psychiatric disorder.

Q2: How broad are the claims in Patent 8,236,766, and what does that mean for competitors?
A: The breadth depends on the language of the independent claims. Broad claims cover a wide chemical or functional space, enabling the patent holder to prevent a range of similar compounds or methods; narrower claims limit this scope, potentially allowing competitors to develop alternative compounds.

Q3: Are there any notable related patents within the same patent family?
A: Yes. Companies often file family members that cover alternative formulations, synthesis methods, or new derivatives, expanding the patent protection geographically or functionally, which supports comprehensive market exclusivity.

Q4: What are the potential challenges to the validity of this patent?
A: Challenges may arise from prior art disclosures, obviousness arguments, or evidence that the claimed invention lacks novelty. Overcoming such challenges requires demonstrating the unexpected advantages or inventive step of the patented claims.

Q5: How can companies leverage this patent landscape for strategic advantage?
A: Companies can use the patent to negotiate licensing deals, design-around strategies, or market differentiation. They can also monitor for potential infringing activity or challenge weak claims through patent validity proceedings.


References:

[1] USPTO Patent Full Text and Image Database, Patent 8,236,766.
[2] Professional patent databases (e.g., Patentscope, Espacenet).
[3] Scientific literature on chemical classes related to the patent.

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Drugs Protected by US Patent 8,236,766

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Vifor Intl KORSUVA difelikefalin acetate SOLUTION;INTRAVENOUS 214916-001 Aug 23, 2021 RX Yes Yes 8,236,766 ⤷  Get Started Free TREATMENT OF MODERATE-TO-SEVERE PRURITUS ASSOCIATED WITH CHRONIC KIDNEY DISEASE (CKD-AP) IN ADULTS UNDERGOING HEMODIALYSIS (HD) ⤷  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 8,236,766

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
European Patent Office 2064228 ⤷  Get Started Free 301199 Netherlands ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free CA 2022 00045 Denmark ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free PA2022522 Lithuania ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free LUC00282 Luxembourg ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free 2022C/546 Belgium ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free C20220035 00379 Estonia ⤷  Get Started Free
European Patent Office 2064228 ⤷  Get Started Free 122022000071 Germany ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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