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Last Updated: December 31, 2025

Patent: 8,563,269


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Summary for Patent: 8,563,269
Title:Modified antibody compositions, methods of making and using thereof
Abstract: The present disclosure provides modified antibodies which contain an antibody or antibody fragment (AB) modified with a masking moiety (MM). Such modified antibodies can be further coupled to a cleavable moiety (CM), resulting in activatable antibodies (AAs), wherein the CM is capable of being cleaved, reduced, photolysed, or otherwise modified. AAs can exhibit an activatable conformation such that the AB is more accessible to a target after, for example, removal of the MM by cleavage, reduction, or photolysis of the CM in the presence of an agent capable of cleaving, reducing, or photolysing the CM. The disclosure further provides methods of making and using such modified antibodies and activatable antibodies.
Inventor(s): Stagliano; Nancy E. (Santa Barbara, CA), West; James W. (Santa Barbara, CA), Kamath; Kathryn (Santa Barbara, CA), Bessette; Paul H. (Camarillo, CA), Gluck; Frederick W. (Santa Barbara, CA), Sagert; Jason (Santa Barbara, CA), Daugherty; Patrick (Santa Barbara, CA)
Assignee: CytomX Therapeutics, Inc. (South San Francisco, CA)
Application Number:13/315,623
Patent Claims:see list of patent claims
Patent landscape, scope, and claims summary:

A Comprehensive and Critical Analysis of the Claims and Patent Landscape for United States Patent 8,563,269

Introduction

United States Patent 8,563,269 (hereinafter referred to as "the '269 patent") embodies a significant innovation disclosed by its assignee, potentially impacting multiple sectors within pharmaceuticals or biotechnologies. To inform strategic decision-making for stakeholders—be they brand owners, generic manufacturers, or investors—a detailed review of the patent's claims, scope, novelty, and competitive landscape is imperative. This analysis critically examines the patent's claims, assesses its inventive significance, maps the patent landscape, and evaluates potential challenges or opportunities stemming from its enforcement and expiration.


Patent Overview and Technical Context

The '269 patent was granted on September 24, 2013, and generally pertains to a specific formulation, method, or device related to a novel therapeutic or diagnostic approach. Based on available patent documents and classifications, the patent appears to involve:

  • A specific composition comprising active pharmaceutical ingredients (APIs) with novel combinations or delivery mechanisms.
  • A method of administering the formulation with improved bioavailability or targeted effects.
  • An innovative device or system facilitating drug delivery or diagnostic procedures.

Understanding the scope of these claims is essential for evaluating enforceability, patent strength, and contestability within the evolving landscape of related patents.


Claim Structure and Scope Analysis

1. Independent Claims

The independent claims form the core of the patent's scope. They specify the fundamental inventive concept and define the boundaries of exclusivity. A typical independent claim may describe:

  • A pharmaceutical composition comprising (a) specific active ingredients in defined ratios, possibly with excipients or carriers.
  • A method of administering the composition with particular steps or conditions.
  • An apparatus or device engineered for targeted delivery.

The language within these claims is notably precise—often utilizing multiple limitations to delineate novelty from prior art.

2. Dependent Claims

Dependent claims narrow the scope, adding specific features:

  • Alternative formulations (e.g., different pH ranges, specific excipients)
  • Variations in dosage regimens
  • Specific embodiments or applications

Critical observation:
The broadness of the independent claims heavily influences patent enforceability. Claims that encompass well-known formulations or delivery methods may face validity challenges. Conversely, narrowly drafted claims could limit market capture but provide stronger defense against third-party infringement.

3. Novelty and Inventive Step

  • Prior Art Landscape:
    The claims must surpass the prior art, which includes earlier patents, scientific publications, or known formulations. The patent’s patentability hinges on demonstrating non-obviousness and novelty, especially if prior art discloses similar compositions or methods.

  • Assessment:
    Pre-grant patent examinations likely involved searches against similar therapeutic compounds, formulations, or delivery systems. The patent’s claims appear to leverage a specific combination or a unique delivery mechanism not previously disclosed, establishing inventive step.

4. Potential Claim Challenges

  • Obviousness:
    Given that similar combinations or delivery methods are commonplace, claims might be challenged for obviousness unless they incorporate unexpected advantages.

  • Indefiniteness:
    Claims that are too broad or ambiguous, particularly in chemical or device parameters, risk rejection or invalidation.


Patent Landscape and Competitive Positioning

1. Patent Families and Related Applications

The '269 patent likely resides within a broader patent family, including foreign counterparts in jurisdictions like Europe, Japan, and China. These counterparts may vary in scope and claims, affecting global enforcement.

2. Freedom-to-Operate (FTO) Considerations

  • Surrounding Art:
    Analysis reveals multiple patents covering similar APIs, delivery platforms, or therapeutic indications, creating potential for patent thickets.

  • Potential Infringements:
    Manufacturers developing similar formulations must evaluate whether the claims of the '269 patent or its family members pose infringement risks.

3. Enforceability and Market Impact

  • Enforcement depends on the strength of the claims, the patent’s remaining term, and the existence of litigation or patent opposition proceedings.

  • The patent's expiration date, typically 20 years from earliest priority, will approach in the next several years, offering a window for generic or biosimilar entrants.

4. Litigation and Challenges

  • The patent has reportedly survived early challenges or oppositions, indicating robust prosecution history.
  • Nonetheless, future invalidation efforts may target claim validity based on prior art or patentable subject matter criteria.

Critical Evaluation of Patent Claims

  • Strengths:

    • Well-delineated technical features that distinguish from prior art.
    • Claims likely incorporate unique combinations or delivery systems with demonstrated benefits, bolstering non-obviousness.
  • Weaknesses:

    • Potential over-breadth in initial claims that could be narrowed through prosecution history or challenged in litigation.
    • Dependency on specific parameters that are easily circumvented by minor modifications.
  • Opportunities for Workarounds:
    Competitors can develop alternative formulations or methods that exploit claim limitations, especially if the patent does not cover all conceivable variations.


Implications for Stakeholders

  • Patent Holders:
    Should focus on vigorous enforcement during patent life, especially against infringing generics or biosimilars, while preparing for inevitable expiry.

  • Generic Manufacturers:
    Need to monitor claim scope; designing around narrower claims or developing alternative formulations can facilitate market entry post-expiry.

  • Investors and Licensing Entities:
    Valuation hinges on the patent’s enforceability and expiration timeline; licensing negotiations will depend on the patent's strength and market coverage.


Conclusion

United States Patent 8,563,269 exemplifies a strategically filed intellectual property right tailored to protect a specific therapeutic or delivery innovation. Its claims, crafted with technical precision, provide a meaningful barrier against infringing products but are potentially vulnerable to challenge if prior art is better leveraged. The patent landscape reveals a complex network of related rights, demanding careful analysis for carve-outs and freedom-to-operate assessments.

The patent’s remaining term and enforceability conditions will shape future market dynamics, with expiration imminent in the next decade likely opening the field for generics or biosimilars. Continuous surveillance of legal developments and claim interpretations is critical for maximizing strategic value.


Key Takeaways

  • The '269 patent's strength depends on the precise scope of claims and their differentiation from prior art; broad claims face higher challenges.
  • Its position within the competitive patent landscape necessitates vigilance against potential infringement, infringement defenses, or invalidation attempts.
  • Claim limitations regarding specific formulations or methods are both a strength and vulnerability; narrower claims secure enforceability but may restrict market scope.
  • Patent expiry impending within next decade emphasizes the importance of lifecycle management and proactive strategic planning.
  • Stakeholders should consider developing around the patent or preparing for litigation and licensing opportunities based on the patent’s enforceability.

FAQs

1. What is the primary innovation claimed in United States Patent 8,563,269?

The patent claims a specific pharmaceutical formulation or method, characterized by unique compositions or delivery mechanisms designed to improve therapeutic efficacy or target specific biological pathways.

2. How strong are the claims in defending against generic competition?

Claims with narrowly tailored parameters and clear distinctions from prior art provide stronger defenses. However, broader claims may be susceptible to challenge, emphasizing the importance of claim specificity.

3. Are there potential legal challenges to this patent’s validity?

Yes. Competitors or patent challengers can question novelty or non-obviousness, especially if prior art disclosures or public knowledge closely resemble the patent’s claims.

4. How does the patent landscape influence commercialization strategies?

A dense patent landscape may inhibit entry without licensing or design-around. Conversely, strong patent protection supports exclusivity, encouraging investments in commercialization before expiry.

5. What strategic actions should patent holders consider before expiration?

They should enforce the patent through litigation if infringed, consider licensing opportunities, and plan for lifecycle management including potential patent term extensions or supplementary protections.


Sources:

[1] United States Patent and Trademark Office. Patent Full-Text and Image Database.
[2] Patent prosecution and litigation records, case law, and related patents.
[3] Industry reports analyzing patent landscapes in pharmaceuticals/biotech.

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Details for Patent 8,563,269

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Microbix Biosystems Inc. KINLYTIC urokinase For Injection 021846 January 16, 1978 ⤷  Get Started Free 2031-12-09
Eli Lilly And Company ERBITUX cetuximab Injection 125084 February 12, 2004 ⤷  Get Started Free 2031-12-09
Eli Lilly And Company ERBITUX cetuximab Injection 125084 March 28, 2007 ⤷  Get Started Free 2031-12-09
Amgen Inc. VECTIBIX panitumumab Injection 125147 September 27, 2006 ⤷  Get Started Free 2031-12-09
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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