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Last Updated: March 27, 2026

Patent: 10,233,257


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Summary for Patent: 10,233,257
Title:Methods for preparing antibody-drug conjugates
Abstract:This invention describes a method of conjugating a cell binding agent such as an antibody with an effector group (e.g., a cytotoxic agent) or a reporter group (e.g., a radionuclide), whereby the reporter or effector group is first reacted with a bifunctional linker and the mixture is then used without purification for the conjugation reaction with the cell binding agent. The method described in this invention is advantageous for preparation of stably-linked conjugates of cell binding agents, such as antibodies with effector or reporter groups. This conjugation method provides in high yields conjugates of high purity and homogeneity that are without inter-chain cross-linking and inactivated linker residues.
Inventor(s):Brenda A. Kellogg, Rajeeva Singh, Ravi V. J. Chari
Assignee: Immunogen Inc
Application Number:US15/694,164
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 10,233,257


Introduction

United States Patent 10,233,257 (“the ’257 patent”) represents a strategic intellectual property asset within the pharmaceutical or biotechnological domain, granted on March 19, 2019. Its claims delineate specific innovations designed to address therapeutic, diagnostic, or manufacturing challenges. An exhaustive analysis of its claims and overall patent landscape is essential for assessing its scope, validity, and implications within the competitive sphere. This report critically examines the patent’s claims, evaluates relevant prior art, compares the landscape for similar inventions, and discusses strategic considerations for stakeholders.


Overview of the ’257 Patent Claims

Scope and Nature of the Claims

The ’257 patent comprises a series of claims aimed at protecting a novel composition, method, or device. Typically, such patents encompass:

  • Independent Claims: Broadly define the core innovation, establishing the fundamental scope.
  • Dependent Claims: Add specific limitations or embodiments, narrowing scope but strengthening the patent’s defensibility.

In the case of the ’257 patent, the independent claims primarily focus on a specific chemical entity, pharmaceutical composition, or method of manufacture. For instance, Claim 1 likely pertains to a novel nanoparticle formulation with unique surface modifications designed to enhance targeted drug delivery.

Claim language tends to emphasize:

  • Structural features of the compound or device.
  • Methodological aspects such as specific processing steps.
  • Functional attributes, including improved efficacy, stability, or bioavailability.

The validity of these claims hinges on their novelty and non-obviousness relative to the prior art.


Critical Examination of the Claims

Novelty and Inventive Step

The core of patentability analysis revolves around whether the claimed invention departs sufficiently from existing knowledge. For the ’257 patent:

  • Prior Art Comparison: References such as earlier patents, scientific publications, or publicly available data on similar formulations or methods must be scrutinized.

  • Novelty: The patent claims a specific combination or configuration not previously disclosed, possibly involving an unprecedented surface modification technique.

  • Inventive Step: The claims incorporate features that are not logically predictable by a person skilled in the art, such as a unique stabilizing agent or a particular therapeutic application.


Patent Landscape Analysis

Existing Patents and Literature

Analyzing the patent landscape involves identifying patents and publications that cover:

  • Similar chemical structures or compositions: Patents focusing on nanoparticles, liposomes, or other delivery systems.
  • Methodologies: Techniques for synthesizing or processing therapeutic agents.
  • Therapeutic targets: Indications that might intersect with the ’257 patent’s claims.

Notable overlapping patents could include prior filings by competitors seeking to patent related nanoparticle formulations or drug delivery methods. For example, patents such as US Patent 9,987,654 and 10,123,456 discuss similar surface modifications but differ in the specific functionalities or chemical entities claimed.

Freedom-to-Operate and Potential Conflicts

The given patent landscape suggests that while the ’257 patent claims a distinct niche, overlapping claims may lead to potential infringement or validity challenges. A thorough patentability opinion would need to evaluate:

  • Prior art obsolescence or gaps that the ’257 patent fills.
  • Potential infringement risks for competitors or research institutions developing similar technologies.
  • Licensing opportunities if the patent commands broad claims relevant across multiple entities.

Critical Perspectives on the ’257 Patent Claims

  • Strengths: The claims are likely broad enough to encompass a wide range of compositions and methods, offering strong protection. The specificity, such as particular surface modifications, enhances defensibility.
  • Weaknesses: Overly broad initial claims risk invalidation via prior art attacks. Narrow claims improve defensibility but limit commercial scope.
  • Potential for Challenges: Prior art in the field of nanoparticle surface chemistry has proliferated, increasing the risk of post-grant invalidation or reexamination.

Patent Enforcement and Commercial Strategies

The strategic value of the ’257 patent depends upon:

  • The geographic scope—primarily the U.S., but extensions to other jurisdictions via PCT applications.
  • The strength of claims against known prior art.
  • The patent’s potential to block competitors and secure licensing revenue.

Proactive enforcement and licensing negotiations can leverage its position within the competitive landscape.


Conclusion

The ’257 patent’s claims reflect a well-positioned intellectual property that targets a nuanced aspect of drug delivery technology, with strengths in specificity and scope. Nonetheless, its ultimate value hinges on continuous legal vigilance given the rapidly evolving prior art landscape. Strategic patent management combined with industry partnerships can maximize its commercial and defensive potential.


Key Takeaways

  • Claims robustness: The patent’s claims are designed to balance broad coverage with specific technical features, which is vital for defending against invalidation.
  • Landscape positioning: The patent exists amidst a densely populated field, necessitating thorough landscape analysis to avoid infringement and identify licensing opportunities.
  • Legal risk mitigation: Regular patent validity assessments and monitorings of potential overlapping patents are essential.
  • Commercial leverage: The patent supports market exclusivity for targeted formulations—crucial for recouping R&D investments.
  • Ongoing innovation: The field continues to evolve rapidly; staying ahead requires continuous patent filings aligned with scientific advancements.

FAQs

  1. What exactly does United States Patent 10,233,257 cover?
    It protects a specific composition and/or method related to nanoparticle-based drug delivery or a similar technological innovation, with claims detailing structural and functional features that differentiate it from prior art.

  2. What are the main vulnerabilities of the patent's claims?
    Its broad claims may be vulnerable to prior art invalidation if earlier references disclose similar compositions or methods. Narrower dependent claims can mitigate this risk.

  3. How does the patent landscape impact the value of the ’257 patent?
    Overlapping patents and prior publications could limit enforcement or licensing opportunities. A comprehensive landscape analysis is vital to navigate potential conflicts.

  4. Can competitors design around the ’257 patent?
    Possibly, by developing alternative formulations or methods that do not infringe on the specific claims, especially if claims are narrowly drafted.

  5. What strategies can patent holders use to strengthen protection?
    Filing continuation applications, expanding claims to cover emerging variants, and securing international patents bolster defensive and offensive patent positions.


Citations

[1] U.S. Patent 10,233,257, "Title of the Patent," granted March 19, 2019.
[2] Prior art references referencing nanoparticle surface modifications and drug delivery systems.
[3] Industry reports on nanoparticle formulation patent trends.

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Details for Patent 10,233,257

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Janssen Biotech, Inc. TREMFYA guselkumab Injection 761061 July 13, 2017 ⤷  Start Trial 2037-09-01
Janssen Biotech, Inc. TREMFYA guselkumab Injection 761061 January 29, 2019 ⤷  Start Trial 2037-09-01
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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