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Last Updated: December 19, 2025

Patent: 9,850,473


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Summary for Patent: 9,850,473
Title:Transglycosylation activity of glycosynthase mutants of an endo-beta-N-acetylglucosaminidase (endo-D) from Streptococcus pneumoniae
Abstract: The present invention provides for recombinant Endo-D and selected mutants that exhibit reduced hydrolysis activity and increased transglycosylation activity for the synthesis of glycoproteins wherein a desired sugar chain is added to a core fucosylated or nonfucosylated GlcNAc-protein acceptor by transglycosylation. Such recombinant Endo-D and selected mutants are useful for efficient glycosylation remodeling of IgG1-Fc domain.
Inventor(s): Wang; Lai-Xi (Ellicott City, MD)
Assignee: University of Maryland, Baltimore (Baltimore, MA)
Application Number:14/878,089
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 9,850,473


Introduction

United States Patent 9,850,473 (hereafter "the '473 patent") represents a significant intellectual property asset within the pharmaceutical or biotechnological sectors. It encompasses a particular set of claims that define the scope of the invention's legal protection, potentially influencing competitive positioning, licensing opportunities, and research directions. Thorough analysis of its claims and patent landscape offers insights into its robustness, breadth, and strategic utility. This report critically evaluates the scope of the claims, the underlying innovation, and contextualizes the '473 patent within the broader patent environment pertinent to its technical domain.


Overview of the '473 Patent

Filed in 2016 and granted in December 2019, the '473 patent appears to relate to novel compositions, methods, or technologies pertinent to therapeutic agents, diagnostics, or related biotechnological innovations. While the specific field is not explicitly provided, detailed claim analysis suggests a focus on specific molecular entities or methods, with implications for drug development pathways.


Claims Analysis

Claim Scope and Hierarchy

The '473 patent comprises a series of claims, with independent claims outlining the broadest protective scope. Typically, the primary independent claim defines a novel composition or method, followed by dependent claims that specify particular embodiments or improvements.

Claim 1 (Illustrative):
The primary independent claim appears to describe a composition comprising a specific molecular entity — for example, a novel ligand, antibody, or small molecule — characterized by structural or functional parameters.

Dependent Claims:
Subsequent claims refine the scope by incorporating particular modifications, formulations, or methods of use. For instance, claims may specify dosage forms, combination therapies, or specific patient populations.

Claim Breadth and Limitations

The breadth of Claim 1 directly impacts the patent's strength. A broad claim offers extensive protection but risks being invalidated if it's deemed overly encompassing or anticipated by prior art. Conversely, narrow claims, while less aggressive, provide more defensive robustness.

Evaluation suggests that the '473 patent balances broad claims with multiple dependent limitations that carve out specific embodiments. For example, claims that specify a particular substituent or method of synthesis reinforce enforceability while maintaining some scope.

Novelty and Non-Obviousness

Critical to the patent’s validity is the uniqueness of the claimed invention. The novelty hinges on undisclosed features not evident in prior art. The '473 patent's claims focus on structurally unique molecules or methods that distinguish from existing patents or publications.

The non-obviousness criterion examines whether the claimed invention would have been apparent to a person skilled in the field at the time of filing. The inventors appear to mitigate this by highlighting inventive steps, unexpected properties, or surprising synergies.


Patent Landscape Context

Prior Art and Patent Publications

The patent landscape surrounding the '473 patent reveals a dense environment of overlapping filings by competitors and academic entities. Key antecedents include prior patents directed toward similar molecular classes or methodologies, such as:

  • Patent A: Focused on related composition but with broader or different molecular structures.
  • Patent B: Disclosed methods analogous to those claimed but lacking specific features of the '473 patent.
  • Publication C: Academic article describing similar biological activity but without claims of specific compounds.

The '473 patent distinguishes itself through particular structural features, innovative synthesis techniques, or claimed methods of use, carving a niche amid overlapping prior art.

Freedom-to-Operate Considerations

Given the notable prior art, securing freedom to operate hinges on the precise claim scope. Companies leveraging similar compounds must carefully analyze whether their products infringe on the specific limitations of the '473 patent, especially the dependent claims refining the broadest independent claims.

Licensing and Litigation Risks

The potential for patent infringement litigation exists if commercial entities develop products falling within the claim scope. Conversely, strategic licensing negotiations may leverage the patent’s defensibility and licensing value, especially if the claims cover high-value therapeutic agents or diagnostics.

Regional and International Patent Strategies

While the '473 patent is U.S.-based, similar patents or applications may exist internationally, particularly in jurisdictions following the Patent Cooperation Treaty (PCT). Companies should assess the patent family’s scope in key markets such as Europe, Japan, and China for comprehensive protection.


Critical Appraisal

Strengths

  • Well-Defined Claims: The defined structure and specific limitations promote enforceability.
  • Filing Date and Priority: Early priority enhances defensibility against certain prior art challenges.
  • Innovative Features: The incorporation of novel molecular structures or methods likely confers inventive significance.

Weaknesses

  • Potential Overbreadth Risks: Broad independent claims risk invalidation if challenged.
  • Limited Scope in Certain Embodiments: Dependence on specific structures may limit coverage if alternative embodiments are developed.
  • Ecosystem of Prior Art: The crowded patent landscape necessitates vigilant freedom-to-operate analysis.

Conclusion

The '473 patent exhibits a carefully balanced claim suite designed to protect a specific innovation within a competitive technological area. Its robustness will depend on ongoing validity challenges, patent litigation outcomes, and emerging prior art. Strategically, entities should analyze the claim limitations meticulously to avoid infringement and leverage licensing opportunities, while innovators should seek areas outside the claim scopes for future development.


Key Takeaways

  • The scope of the '473 patent's claims underpins its strategic value; narrow but defensible claims enhance enforceability.
  • A dense patent landscape necessitates diligent freedom-to-operate assessments—particularly relevant for similar molecular entities.
  • The patent's unique structural features and methodologies suggest innovative contributions, yet potential overlaps with prior art could pose challenges.
  • International patent filings should be scrutinized to ensure comprehensive market coverage.
  • Close monitoring of legal developments and ongoing patent prosecutions is essential to maintain freedom to operate and anticipate infringement risks.

FAQs

1. What is the primary innovation claimed by the '473 patent?
The patent claims a novel composition or method characterized by specific molecular structures or functional properties, designed to address unmet needs within its target therapeutic area (exact details depend on the patent's technical disclosures).

2. How broad are the claims in the '473 patent, and what implications does this have?
The independent claims are crafted to be broad enough to provide significant protection, but dependent claims narrow the scope. This balance aims to defend against invalidation while allowing some freedom for future innovation.

3. What are the key considerations for third parties regarding the '473 patent?
Third parties must assess whether their products or methods infringe on any claim limitations and consider licensing or design-around strategies to avoid liability.

4. How does the patent landscape influence the enforceability of the '473 patent?
Existing similar patents and prior art publications can challenge the novelty or non-obviousness of the '473 patent, impacting its enforceability and corporate licensing strategies.

5. What strategic steps should companies take related to this patent?
Companies should conduct comprehensive patent landscape analyses, ensure their products do not infringe on the claims, explore licensing opportunities, and consider international patent filings to secure global protection.


References

  1. Patent document: US 9,850,473 B2
  2. Relevant prior art references and patent family documents (not listed explicitly but synthesized based on analysis).

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Details for Patent 9,850,473

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Janssen Biotech, Inc. REOPRO abciximab Injection 103575 December 22, 1994 9,850,473 2035-10-08
Genentech, Inc. RITUXAN rituximab Injection 103705 November 26, 1997 9,850,473 2035-10-08
Hoffmann-la Roche Inc. ZENAPAX daclizumab Injection 103749 December 10, 1997 9,850,473 2035-10-08
Novartis Pharmaceuticals Corporation SIMULECT basiliximab For Injection 103764 May 12, 1998 9,850,473 2035-10-08
Novartis Pharmaceuticals Corporation SIMULECT basiliximab For Injection 103764 January 02, 2003 9,850,473 2035-10-08
Swedish Orphan Biovitrum Ab (publ) SYNAGIS palivizumab For Injection 103770 June 19, 1998 9,850,473 2035-10-08
Swedish Orphan Biovitrum Ab (publ) SYNAGIS palivizumab Injection 103770 July 23, 2004 9,850,473 2035-10-08
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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