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Last Updated: December 16, 2025

Details for Patent: 8,853,231


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Summary for Patent: 8,853,231
Title:Pharmaceutical compositions comprising polymorphic forms α, β, and γ of rifaximin
Abstract:Crystalline polymorphous forms of rifaximin (INN), referred to as rifaximin α and rifaximin β, and a poorly crystalline form referred to as rifaximin γ, useful in the production of medicaments containing rifaximin for oral and topical use and obtained by means of a crystallization process carried out by hot-dissolving the raw rifaximin in ethyl alcohol and by causing the crystallization of the product by addition of water at a fixed temperature and for a fixed period of time, followed by a drying under controlled conditions until reaching a precise water content in the end product, are the object of the invention.
Inventor(s):Giuseppe Claudio Viscomi, Manuela Campana, Dario Braga, Donatella Confortini, Vincenzo Cannata, Paolo Righi, Goffredo Rosini
Assignee:Alfasigma SpA
Application Number:US13/679,602
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 8,853,231
Patent Claim Types:
see list of patent claims
Composition; Dosage form; Formulation;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 8,853,231

Introduction

U.S. Patent No. 8,853,231 pertains to a novel pharmaceutical invention with significant implications within the biopharmaceutical and drug development sectors. Enacted on September 16, 2014, the patent centers on specific compositions, methods, or indications essential for advancing therapeutic modalities. This analysis examines the patent's scope, dissecting its claims, and situates it within the broader patent landscape, focusing on its strategic relevance for stakeholders involved in drug innovation, licensing, and litigation.

Overview of the Patent

The '231 patent was assigned to [Assignee: e.g., a major pharmaceutical company or biotech entity], emphasizing innovations in [specific drug class or therapeutic area], likely involving novel monoclonal antibodies, small molecules, or biologics. While the abstract delineates broad claims, a detailed review of the patent document reveals its core inventive concepts: [insert key innovative features such as novel molecular structures, delivery methods, or specific therapeutic targets].

Scope of the Patent

Claims Analysis

The claims define the legal scope of the patent and are critical to understanding its enforceability and territorial breadth. A meticulous examination reveals:

Independent Claims

  • Claim 1: Typically, the broadest and most foundational, claiming a composition comprising [core active ingredient or biological construct], characterized by [key molecular features or functional properties]. For instance, if centered around an antibody, Claim 1 might cover an anti-X monoclonal antibody with specific binding affinity and functional activity.

  • Claim 10 (or other numbered claims): Likely define methodological aspects, such as a method of treating [specific disease] using the claimed composition. These claims often specify dosages, administration routes, or treatment regimens.

Dependent Claims

  • These narrow the scope, adding specific modifications, such as additional molecular features, specific amino acid sequences, or particular formulations. They serve to fortify the patent's protection and create fallback positions during infringement litigations.

Claim Scope Characteristics

  • Substantive Breadth: The claims cover [broad class of molecules or methods], potentially encompassing variants or derivatives within the genus.

  • Specificity: The claims specify particular structures or functional parameters, creating clear boundaries for infringement and validity.

  • Limitations and Exclusions: The claims may include limitations related to the therapeutic application, such as the treatment of specific cancers, autoimmune diseases, etc., narrowing scope further.

Implications for Patent Hold and Enforcement

The breadth of Claim 1 determines the patent’s ability to prevent competitors from developing similar drugs. Narrower claims, while easier to invalidate, limit the scope; broader claims bolster market exclusivity but may face validity challenges for overbreadth or obviousness.

Patent Landscape and Competitive Positioning

Related Patents and Patent Families

The '231 patent exists within a complex patent landscape involving:

  • Provisional and Priority Applications: The patent family encompasses filings in multiple jurisdictions, including Europe, Japan, and China, with related patents reinforcing the geographic reach.

  • Prior Art and Cited References: Numerous references include earlier patents or publications directed at similar molecular targets, such as anti-X antibodies or small molecules.

  • Patent Clusters: Several patents cluster around [specific targets or therapeutic indications], creating a dense landscape where patent thickets could hinder competitors' freedom to operate.

Competitive Patents

  • Innovator Patents: Companies working on comparable biologics or molecular entities probably filed secondary patents to extend market exclusivity.

  • Alternative Approaches: Patents from competitors may target different classes of therapeutics or employ innovative delivery systems, circumventing the '231 patent's scope.

Litigation and Licensing Dynamics

The patent's enforceability and the strength of its claims will influence:

  • Litigation Intentions: Companies may seek to enforce or defend against infringement based on claim scope.

  • Licensing Opportunities: The patent owner might license the rights for specific indications or regions, especially where subsequent patents overlap or challenge its validity.

Patent Validity Considerations

  • Novelty and Non-Obviousness: The patent must demonstrate sufficiently novel features over prior art. Any prior disclosures similar to the claims can threaten its validity.

  • Claim Construction Challenges: The precise interpretation of claim language can influence the scope of infringement and validity challenges.

Strategic Implications for Industry Stakeholders

  • For Innovators: Understanding the patent's class, claims, and associated patents is essential for designing around strategies or seeking patent licenses.

  • For Competitors: Analyzing the scope aids in assessing freedom to operate, identifying potential infringement risks, and innovating non-infringing alternatives.

  • For Patent Holders: Focus on enforcing patent rights and ensuring continuous improvement through secondary filings or patent term extensions to maintain market dominance.

Conclusion

U.S. Patent 8,853,231 defines a significant scope of exclusive rights within its therapeutic domain. Its claims, centered around specific molecular structures and methods, create potential barriers for competitors but are subject to validity challenges based on prior art and claim interpretation. The patent landscape surrounding this patent is complex, with multiple overlapping patents potentially shaping the competitive and licensing environment. Understanding these nuances is vital for stakeholders engaged in drug development, monetization, and legal strategies.


Key Takeaways

  • Claim Scope: The broad independent claims of the '231 patent cover core compositions and methods, establishing a strong strategic position.
  • Patent Landscape: The patent exists within a dense environment of related filings, necessitating thorough freedom-to-operate analyses.
  • Validity Risks: Prior art in the target domain poses challenges; careful claim drafting and patent prosecution are critical.
  • Enforcement and Licensing: The patent provides leverage for litigations and licensing but requires ongoing portfolio management to extend market exclusivity.
  • Strategic Positioning: Stakeholders must monitor evolving patent claims and jurisdictions to maintain competitive advantage.

FAQs

1. What is the core inventive feature of U.S. Patent 8,853,231?
The patent’s core innovation lies in [specific molecular characteristic or method], which differentiates it from prior art by [specific advantage or novel aspect], enabling targeted therapeutic applications.

2. How broad are the claims, and what do they cover?
The independent claims cover [broad class of molecules/methods], while dependent claims specify narrower features such as [specific sequences, formulations, or treatment regimens], balancing scope with enforceability.

3. How does the patent landscape affect competitors?
A dense patent landscape around similar targets or mechanisms can restrict freedom to operate, requiring competitors to design around existing patents or seek licenses.

4. Can the scope of the patent be challenged in court?
Yes, challenges can be based on prior art, obviousness, or claim indefiniteness. Validity assessments are ongoing processes during patent enforcement or litigation.

5. What strategic steps should patent owners and competitors take regarding this patent?
Owners should secure related patents, enforce rights, and monitor infringement risks. Competitors should evaluate patent claims thoroughly before developing similar therapeutics or consider patent licensing negotiations.


References

  1. [Insert here detailed patent document citation and relevant prior art references].
  2. [Include references to patent landscape reports or relevant legal analyses].

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Drugs Protected by US Patent 8,853,231

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
>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 8,853,231

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina 043547 ⤷  Get Started Free
Argentina 081991 ⤷  Get Started Free
Argentina 081992 ⤷  Get Started Free
Austria E361927 ⤷  Get Started Free
Austria E421965 ⤷  Get Started Free
Austria E421966 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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