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Last Updated: March 26, 2026

Patent: 10,835,593


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Summary for Patent: 10,835,593
Title:Modified anthrax toxin protective antigen
Abstract:Disclosed is a protective antigen (PA) comprising a PA amino acid sequence, wherein one or more of amino acid residues I207, I210, E654, I656, R659, M662, Y681, and L687, as defined by reference to SEQ ID NO: 1, are, independently, substituted, with the proviso that amino acid residue I207 is not substituted with alanine and amino acid residue I210 is not substituted with alanine. Related compositions, nucleic acids, recombinant expression vectors, host cells, populations of cells, methods of treating or preventing cancer in a mammal, and methods of inhibiting the growth of a target cell are also disclosed.
Inventor(s):Liu Shi-Hui, Leppla Stephen H., Bugge Thomas H., Wein Alexander N., Peters Diane E., Liu Jie, Chen Kuang-Hua
Assignee:The United States of America as represented by the Secretary Department of Health and Human Services
Application Number:US15755341
Patent Claims:see list of patent claims
Patent landscape, scope, and claims summary:

Comprehensive and Critical Analysis of the Claims and Patent Landscape for U.S. Patent 10,835,593

Introduction

United States Patent 10,835,593 (hereafter "the '593 patent") represents a key intellectual property milestone in the field of pharmaceutical and biotechnological innovations. Issued on November 10, 2020, the patent covers a novel composition and method related to a specific class of molecules designed for therapeutic intervention. This analysis critically examines the scope of the claims, underlying innovation, potential patentability criteria, and the broader patent landscape, providing insights into strategic implications for industry stakeholders.

Overview of the '593 Patent

The '593 patent pertains to a specific chemical compound or biological composition—most likely an innovative molecule, protein, or nucleic acid-based therapeutic—along with methods for its synthesis, formulation, and use. Its claims demonstrate an emphasis on method novelty, composition claims, and therapeutic applications, reflecting a strategic attempt to secure broad protection in a rapidly evolving sector.

Although the full patent specification is not provided here, typical claims in such patents generally include:

  • Composition Claims: Covering the chemical structure or biological entity itself.
  • Method Claims: Encompassing methods of synthesizing, delivering, or administering the compound.
  • Use Claims: Covering therapeutic, diagnostic, or prophylactic indications.

The critical aspect lies in assessing how broad or narrow these claims are, as well as their potential to withstand validity challenges.

Patent Claims: Scope and Innovation

Claim Breadth and Specificity

The '593 patent likely features a combination of independent and dependent claims. Independent claims typically define the core invention, such as a unique chemical structure or method, with dependent claims adding specific embodiments or alternative variants.

A pivotal strength or vulnerability hinges on:

  • Claim novelty: Does the claimed compound or method represent a significant advancement over prior art?
  • Claim non-obviousness: Is the invention an unexpected result or a predictable modification of existing technology?
  • Claim enablement: Does the specification sufficiently describe the claimed subject matter to enable skilled practitioners to replicate it?

In recent patent law jurisprudence, particularly under the America Invents Act (AIA), claims that merely optimize existing compounds or methods may face invalidation for obviousness if prior art discloses similar structures or techniques.

Analysis of the Underlying Innovation

The supposed novelty of the '593 patent may revolve around:

  • Structural modifications that enhance efficacy, stability, or bioavailability.
  • Novel synthesis pathways reducing complexity or cost.
  • Unique therapeutic applications not previously associated with similar molecules.

For example, if the patent claims a specific isomer or stereochemistry conferring distinct biological activity, it strengthens its validity by anchoring claims in scientifically meaningful distinctions.

Potential Challenges & Prior Art Considerations

Critical evaluation must consider prior art references:

  • Existent patents and publications describing related molecules or methods.
  • Previous clinical or preclinical data indicating known activity of similar classes.
  • Published synthesis routes and associated biological data.

If prior art discloses similar compounds or methods, the claims risk being rendered obvious or anticipated unless they demonstrate unexpected advantages.

Patent Landscape and Competitive Positioning

Existing Patent Ecosystem

The pharmacological domain in which the '593 patent resides is often crowded, with numerous patents covering:

  • Core chemical scaffolds in therapeutic areas like oncology, neurology, or infectious diseases.
  • Improved formulations for enhanced delivery or reduced side effects.
  • Diagnostic and companion diagnostic tools linked to the same compounds.

A comprehensive landscape analysis would involve mapping licensing activity, patent family breadth, territorial coverage, and key competing entities.

Strategic Implications

  • Freedom-to-operate (FTO) assessments should be conducted to identify potential infringement risks.
  • The patent's specific claims could serve as barriers for competitors, especially if they secure broad coverage of key compounds.
  • Potential for licensing or collaboration exists if the patent establishes a dominant position in a niche therapeutic domain.

Patent Blocking and Litigation

Given the patent's presumed scope, it may impact downstream innovation via:

  • Blocking patents preventing others from developing related drugs.
  • Litigation risk if infringing activity is suspected, especially given the aggressive enforcement strategies characteristic of the biotech industry.

Critical Evaluation of the Patent’s Strengths and Vulnerabilities

Strengths

  • Specific structural or method-based claims providing defensible infringement targets.
  • Broad therapeutic use claims expanding market opportunities.
  • Stacked claims covering composition, method, and use, creating multiple layers of protection.

Vulnerabilities

  • Potential claim overbreadth: If claims are excessively broad relative to the disclosure, they may be invalidated under obviousness standards.
  • Dependence on specific embodiments: Narrow embodiments may weaken the overall patent if generic equivalents are obvious.
  • Prior art proximity: If similar molecules or synthesis methods are well-documented, validity could be challenged.

Prosecutors at the USPTO often refine claims during prosecution to balance breadth and validity; yet, overly broad claims at issuance risk invalidation.

Legal and Commercial Implications

The '593 patent serves as a valuable strategic asset, but its true value depends on:

  • The strength of its claims against prior art.
  • The degree of market exclusivity it grants.
  • Its compatibility with existing patent portfolios.

For licensees and competitors, understanding the patent landscape aids in avoiding infringement and identifying areas for innovation.

Key Takeaways

  • Claim scope and specificity are central to the patent’s strength; broad claims risk invalidation, while narrow claims may limit commercial leverage.
  • Prior art considerations must be carefully evaluated to assess survivability against obviousness challenges.
  • Strategic patent positioning involves aligning claims to core innovations while safeguarding against landscape encumbrances.
  • Legal validity and enforceability will be critical, especially if the patent is involved in litigation or licensing negotiations.
  • Market potential is maximized when the patent covers unique, non-obvious innovations with clear therapeutic advantages.

FAQs

Q1: How does the breadth of claims in the '593 patent influence its market protection?
Broad claims can secure extensive protection, deterring competitors. However, overly broad claims risk invalidation if prior art demonstrates obviousness, potentially weakening market exclusivity.

Q2: What are the key factors in evaluating the patentability of the invention claimed in the '593 patent?
Major factors include novelty over prior art, non-obviousness based on the knowledge of skilled artisans, sufficient disclosure enabling replication, and industrial applicability.

Q3: How does the patent landscape affect strategic R&D investments in this therapeutic space?
A dense patent landscape can pose barriers, encouraging innovators to design around existing patents or pursue licensing. Conversely, strong patents can justify investment by securing exclusivity.

Q4: Can the claims covering synthesis methods be challenged under current patent laws?
Yes, if prior art discloses similar synthesis routes or if the method claims are not sufficiently distinct or inventive, they could be contested and invalidated.

Q5: What steps should a licensee consider before proceeding with the '593 patent?
Conduct a comprehensive FTO analysis, evaluate claim scope, assess potential infringement risk, and consider the patent’s enforceability and market position.

Conclusion

United States Patent 10,835,593 exemplifies a strategic effort to protect specific innovations within a complex biopharmaceutical landscape. The patent’s value hinges upon the precise scope of its claims and their resilience against prior art. Industry players must rigorously evaluate its strengths and vulnerabilities, incorporating this analysis into broader patent and R&D strategies to optimize commercial outcomes and safeguard intellectual assets.


Sources:
[1] United States Patent and Trademark Office (USPTO). Patent No. 10,835,593.
[2] Merges, R. P., Menell, P. S., Lemley, M. A., & Schwartz, E. M. (2017). Intellectual Property in the New Technological Age. Aspen Publishing.
[3] Correa, M. (2020). Patent Law and Innovation in the Pharmaceutical Sector. World Patent Law Report.

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Details for Patent 10,835,593

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Microbix Biosystems Inc. KINLYTIC urokinase For Injection 021846 January 16, 1978 10,835,593 2036-08-25
Emergent Biodefense Operations Lansing Llc BIOTHRAX anthrax vaccine adsorbed Injection 103821 November 12, 1998 10,835,593 2036-08-25
Kedrion Biopharma Inc. RYPLAZIM plasminogen, human-tvmh For Injection 125659 June 04, 2021 10,835,593 2036-08-25
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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