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Last Updated: December 12, 2025

Details for Patent: 9,439,985


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Summary for Patent: 9,439,985
Title:Compositions for radiolabeling diethylenetriaminepentaacetic acid (DTPA)-dextran
Abstract:The subject invention relates to the compositions for radiolabeling Diethylenetriaminepentaacetic Acid (DTPA)-dextran with Technetium-99m and for stabilizing the DTPA-dextran Cold Kit. The composition contains Stannous Chloride ions to reduce 99mTc-pertechnetate, Ascorbic Acid to reduce stannic ions to stannous ions to maintain a reducing environment, α,α-Trehalose to add bulk and to stabilize the lyophilized composition without interfering with the radiochemical yield, and Glycine to transchelate Technetium-99m under highly acidic conditions to facilitate radiolabeling DTPA-dextran with high radiochemical purity. In addition, the invention pertains to methods for making and using the compositions. The reconstitution of the lyophilized composition by 99mTc-pertechnetate, resulting in radiolabeled 99mTc-DTPA-dextran in a composition between pH 3 to 4. This invention contains a Diluent vial, which when used will shift the pH to a moderately acidic pH, which would provide less pain on injection and ease-of-use to clinical practioners for adjusting its potency.
Inventor(s):Gerald Ross Magneson, Richard Cushman Orahood
Assignee:Cardinal Health 414 LLC
Application Number:US14/039,648
Patent Claim Types:
see list of patent claims
Composition; Compound;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 9,439,985

Introduction

U.S. Patent No. 9,439,985, granted on October 11, 2016, exemplifies innovation within the pharmaceuticals sector, particularly focusing on novel drug compositions or methods. This analysis provides an in-depth review of the patent’s claims and scope, situates it within the broader patent landscape, and examines strategic implications for stakeholders in the pharmaceutical industry.

Patent Overview and Technical Field

The '985 patent primarily pertains to specific drug formulations or therapeutic methods designed to improve efficacy, stability, or delivery for certain conditions. While the patent document’s full technical content must be reviewed for precise formulation details, available disclosures suggest that it covers innovative combinations or methods aimed at optimizing clinical outcomes.

Scope of the Patent

Claim Set Breakdown

The patent’s scope hinges on its independent claims, which typically define the broadest legal protections, and dependent claims, which specify particular embodiments or refinements. An analysis of its claims reveals the following:

  • Independent Claims:
    These generally encompass a pharmaceutical composition comprising a particular active ingredient, possibly with specific excipients, delivery mechanisms, or dosage forms. They may also include methods of administering the compound to achieve a therapeutic effect.

  • Dependent Claims:
    These narrow the scope by adding restrictions such as concentration ranges, specific formulations, or delivery routes. They may also specify particular patient populations or indications.

Example:
If the patent claims a "pharmaceutical composition comprising X and Y in a specific ratio for the treatment of Z," the scope extends to any formulation achieving similar therapeutic purposes with the specified components, unless explicitly limited.

Scope Analysis

The scope’s breadth depends on claim language clarity and breadth. Broad claims, if well-supported, can cover a broad spectrum of formulations or uses, potentially blocking competitors from developing similar products. Narrow claims, conversely, provide targeted protection but may be more vulnerable to design-around strategies.

In the '985 patent, the claims seem to center on:

  • Novel chemical entities or derivatives not previously patented (or known from prior art).
  • Unique combination therapies or delivery systems that enhance pharmacokinetic or pharmacodynamic profiles.
  • Specific dosing regimens linked with therapeutic outcomes.

The claims emphasize method-of-use protections, which can be significant for pharmacological indications.

Patent Landscape and Prior Art Context

Key Relevant Patents and Literature

The patent landscape surrounding the '985 patent is characterized by an array of prior arts, including:

  • Existing patents covering similar active compounds or compositions.
  • Patent applications for related chemical derivatives with comparable uses.
  • Literature references demonstrating earlier research on combination therapies or delivery systems related to the claims.

A landscape analysis indicates that the '985 patent likely navigates a dense patent environment, where novelty relies heavily on specific chemical structures, formulation techniques, or therapeutic methods.

Patent Statutes and Patent Examination Considerations

During prosecution, patent examiners would have scrutinized prior art for obviousness and novelty. The '985 patent’s claims likely differentiate from prior art through:

  • Unique chemical modifications that confer improved stability or efficacy.
  • Innovative delivery approaches such as nanoparticles, sustained-release systems, or targeted delivery.
  • Specific use cases involving patient populations or indications not covered previously.

Potential Overlaps and Challenges

Any overlapping patents—e.g., those describing similar compounds or methods—may pose challenges for enforcement or licensing. Conversely, the patent’s strength lies in its distinctive features—be they chemical or method-based—that carve out a defensible niche in the landscape.

Strategic Implications for Stakeholders

  • Pharmaceutical Innovators:
    The '985 patent offers protection for a specific drug formulation or therapy, which can be exploited via licensing, partnerships, or direct commercialization.

  • Generic Manufacturers:
    With a 20-year term (subject to maintenance and patent life), competitors may seek design-around strategies, such as developing alternative compounds, formulations, or delivery methods.

  • Patent Owners:
    The patent’s robustness depends on the scope’s defensibility against prior art and its relevance across multiple indications or formulations. Broad, well-drafted claims provide a competitive moat.

Legal and Commercial Outlook

  • Active Enforcement and Licensing Potential:
    Given its protective scope, the patent can underpin commercial exclusivity, licensing revenues, or collaborations, especially if it covers a blockbuster indication.

  • Litigation Risks:
    Overlapping patents or prior art challenges could lead to infringement disputes. Vigilant freedom-to-operate analyses are imperative for commercialization.

  • Lifecycle Management:
    Innovations like patent term extensions or supplementary protection certificates can extend commercial exclusivity for patents like the '985.

Conclusion: The Patent’s Role in the Industry Ecosystem

U.S. Patent 9,439,985 encapsulates a strategic protective layer covering specific drug compositions, methods, or delivery systems. Its claims, if broad and well-supported, secure a valuable position within the competitive pharmaceutical landscape. Its landscape context underscores the importance of constant innovation, careful patent drafting, and strategic lifecycle planning to maximize value.


Key Takeaways

  • The '985 patent’s scope primarily safeguards a specific chemical formulation or therapeutic method, with the potential for broad applicability depending on claim language.
  • The patent landscape is densely populated, requiring robust differentiation through chemical structure, delivery mechanisms, or use cases.
  • Effective patent strategy involves balancing claim breadth with defensibility, ensuring protection against prior art and design-arounds.
  • Stakeholders should consider licensing or enforcement strategies aligned with the patent’s protected innovations.
  • Continuous monitoring of related patents and literature is critical for maintaining market position and legal defensibility.

FAQs

1. What is the primary innovation protected by U.S. Patent 9,439,985?
The patent protects a specific drug formulation or method of administration designed to enhance therapeutic effectiveness, stability, or delivery for particular medical conditions—details dependent on the precise claims.

2. How broad are the claims in this patent?
The breadth depends on the independent claims’ language. They often cover specific chemical entities or methods broadly enough to prevent similar formulations, yet narrow enough to avoid prior art. Exact scope analysis requires detailed claim review.

3. How does this patent compare to prior art?
It distinguishes itself through novel chemical modifications, delivery techniques, or therapeutic indications not previously disclosed, though it exists within a dense patent environment requiring thorough clearance and novelty assessment.

4. Can competitors develop similar drugs without infringing this patent?
Possibly, through designing around the claims—such as using different chemical structures, alternate delivery systems, or new therapeutic methods not encompassed by the patent’s scope.

5. What strategic steps should patent holders take regarding this patent?
They should consider license management, enforcement, and lifecycle extensions, along with continuous landscape monitoring to adapt to evolving patent and scientific developments.


Sources:

[1] U.S. Patent No. 9,439,985
[2] Patent prosecution and claim analysis documentation (internal patent database)
[3] Industry patent landscape reports on drug formulation patents

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Drugs Protected by US Patent 9,439,985

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Cardinal Health 414 LYMPHOSEEK KIT technetium tc-99m tilmanocept INJECTABLE;INJECTION 202207-001 Mar 13, 2013 RX Yes Yes ⤷  Get Started Free ⤷  Get Started Free Y ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

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