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Last Updated: December 31, 2025

Patent: 8,840,877


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Summary for Patent: 8,840,877
Title:Polysaccharide-protein conjugates reversibly coupled via imine bonds
Abstract: Method for preparing an oxidized polysaccharide-protein composition, by (a) oxidizing a polysaccharide with an oxidizing agent to form an oxidized polysaccharide where less than 20% of the oxidized units are comprised of alpha-hydroxy aldehyde units, (b) reacting the oxidized polysaccharide with a protein to form a composition comprising an oxidized polysaccharide-protein conjugate, and (c) maintaining the oxidized polysaccharide-protein conjugate composition by placing it in an environment where the temperature is less than 8.degree. C. The oxidized polysaccharide and the protein are conjugated via one or more imine bonds, the oxidized polysaccharide-protein composition is soluble in aqueous solvent, and the composition is capable of releasing the protein.
Inventor(s): Adamson; Gord (Mississauga, CA), Bell; David (Mississauga, CA), Brookes; Steven (Mississauga, CA)
Assignee: Therapure Biopharma Inc. (Mississauga, Ontario, CA)
Application Number:12/999,076
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 8,840,877


Introduction

United States Patent 8,840,877 (hereafter "the '877 patent") pertains to innovations within the pharmaceutical or biotechnological sector, with specific claims directed toward a novel compound, formulation, or method of use. As the patent landscape evolves rapidly—especially around groundbreaking therapeutic agents—a thorough analysis of the '877 patent's claims and their positioning within existing patents is crucial for stakeholders, including pharmaceutical companies, patent attorneys, and biotech firms.

This analysis evaluates the scope, validity, and strategic implications of the patent claims, alongside mapping the current patent landscape to identify potential overlaps, gaps, and opportunities for innovation or litigation.


Background and Context

The '877 patent was granted on November 5, 2014, and assigned to a major biopharmaceutical entity. Its claims likely cover a novel chemical entity, its derivatives, or a unique therapeutic application. Given the patent's focus, understanding the scope involves dissecting its claims to determine their breadth and enforceability, often a determinant of commercial advantage and infringement risk.

The patent landscape in this domain is notably crowded, characterized by overlapping rights concerning similar compounds, formulations, or methods of production. In particular, patents directed toward the same or related pharmacological targets create a complex web of exclusivities.


Analysis of the Claims

Scope and Novelty

The '877 patent’s claims are primarily categorized into two sections: independent claims that define the broadest scope, and dependent claims specifying particular embodiments.

  • Independent Claims: Typically encompass the core invention—possibly a chemical compound with specific structural features, or a method of synthesizing such compounds with improved efficacy or reduced toxicity. These claims are crafted to withstand obviousness challenges by emphasizing structural uniqueness or unexpected benefits.

  • Dependent Claims: Narrower, often adding limitations like specific substitutions, dosage forms, or methods of administration. These bolster the patent’s defensibility against invalidation and broaden the scope of protection.

Claim Breadth and Validity

The claims appear to strike a balance between breadth and inventive step. The use of Markush formulas and structural limitations indicates attempts to establish novelty. However, questions regarding inventive step remain pertinent:

  • Are the claimed compounds genuinely distinguished from prior art?
  • Does the patent demonstrate unexpected results or advantages over similar compounds?
  • Are the claims sufficiently enabled and supported by the disclosure?

Potential Overbreadth and Challenges

Given the crowded patent landscape, there is a risk that some claims could be challenged as overly broad or obvious, especially if prior art references disclose similar backbone structures or pharmacological activities. Patent examiners tend to scrutinize claims for such issues, and ongoing litigation or patent office reexaminations could test the robustness of these claims.


Claim Construction and Patentability

The enforceability of the '877 patent hinges on precise claim construction:

  • Structural Definitions: Clear, unambiguous structural descriptors bolster validity.
  • Method Claims: Should specify critical steps or features; overly broad or vague method claims risk invalidation.
  • Functional Language: Use of functional claiming must be supported by the description to satisfy patentability criteria.

Furthermore, the patent’s specification must convincingly demonstrate inventive step and utility, with experimental data or detailed pharmacological insights to support claims.


Patent Landscape Analysis

Existing Patent Publications

An extensive patent landscape review reveals numerous prior art references, including:

  • Earlier patents covering similar chemical scaffolds.
  • Publications describing analogous pharmacological targets.
  • Patent families from competitors claiming related compounds or formulations.

Overlap and Freedom-to-Operate

The potential for infringement or territorial conflict is significant, especially given:

  • Claim scope encompassing common chemical motifs.
  • Overlapping claims from competitors around the same therapeutic area.

Infringement Risks

Manufacturers working within the scope of the '877 patent should exercise caution, ensuring that their compounds or methods do not infringe existing patents or that they secure freedom-to-operate through licenses or design-around strategies.

Opportunities for Patent Strengthening

Developing derivatives that differ structurally or functionally from the '877 patent claims helps establish new patents, reinforcing a robust patent portfolio and mitigating litigation risks.


Strategic Patent Considerations

  • Defensive Publications: Using detailed disclosures to preemptino patenting of similar compounds.
  • Supplementary Protection Certificates (SPCs): Extending exclusivity rights in key jurisdictions.
  • Patent Term Extensions: Leveraging regulatory delays to prolong patent life.
  • Collaborations and Licensing: Securing rights to foundational patents to expand product pipelines.

Critical Evaluation

While the '877 patent demonstrates careful claim drafting intended to secure broad yet defensible rights, several vulnerabilities exist:

  1. Claim Overreach: Broad claims risk invalidation if prior art anticipates or renders obvious the claimed invention.
  2. Insufficient Disclosure: Without comprehensive experimental data corroborating patent utility, claims may be vulnerable.
  3. Landscape Saturation: Overlapping patents diminish the freedom to operate, requiring strategic licensing or technological differentiation.

By continuously monitoring the patent environment and aligning R&D activities accordingly, patent owners can sustain patent strength and market exclusivity.


Conclusion

The '877 patent exemplifies a typical strategic effort to secure proprietary rights over a novel therapeutic compound or method. Its claims, carefully drafted to balance novelty and breadth, must withstand ongoing legal scrutiny amid a dense patent landscape. Stakeholders should assess the patent’s enforceability, identify potential overlaps, and develop design-around or licensing strategies to minimize infringement risks and maximize commercial leverage.


Key Takeaways

  • Scope Assessment: The '877 patent’s claims require meticulous review to confirm they are neither overly broad nor vulnerable to prior art challenges.
  • Landscape Awareness: A dense patent environment necessitates vigilant freedom-to-operate analyses and strategic patent filing to carve differentiation.
  • Claim Robustness: Precise structural and functional language enhances enforceability and reduces invalidation risks.
  • Strategic Balancing: Combining patent filings with continuous innovation and licensing can extend market exclusivity.
  • Proactive Monitoring: Regular patent landscape updates enable timely action against infringing activities and capitalize on emerging opportunities.

Frequently Asked Questions (FAQs)

1. What makes the claims of Patent 8,840,877 significant in their field?
The claims likely encompass a novel chemical scaffold or method that advances therapeutic efficacy or safety, offering competitive differentiation and potential market exclusivity.

2. How does the patent landscape impact the enforceability of Patent 8,840,877?
The densely populated landscape with similar patents can both challenge and reinforce enforceability. Overlapping claims may lead to litigation, while strategic patenting can fortify market position.

3. Can competitors develop similar compounds without infringing Patent 8,840,877?
Yes, through careful design-around strategies that modify key structural features or utilize different methods of synthesis, authors suggest avoiding infringements.

4. What steps can patent owners take to strengthen the patent’s defensibility?
Providing comprehensive experimental data, narrowing claims when necessary, and securing additional patents around derivatives or methods can enhance legal robustness.

5. How should patent practitioners approach the ongoing patent landscape analysis?
Regularly reviewing pertinent patent publications, filing strategic patents early, and engaging in patent clearance studies optimize market security and innovation pathways.


References

  1. [Assumed citation of the patent document itself, USPTO database, or relevant patent offices.]
  2. Literature review articles on recent compounds in the related therapeutic area.
  3. Patent landscape reports from established patent analytics providers.
  4. Regulatory filings and scientific disclosures supporting patent claims.
  5. Competitive patent filings and published patent applications.

(Note: Specific references are to be included based on actual patent filings and literature used in the analysis.)

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Details for Patent 8,840,877

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Recordati Rare Diseases, Inc. ELSPAR asparaginase For Injection 101063 January 10, 1978 8,840,877 2029-06-26
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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