Last Updated: May 10, 2026

Details for Patent: 10,881,747


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Which drugs does patent 10,881,747 protect, and when does it expire?

Patent 10,881,747 protects CYTALUX and is included in one NDA.

This patent has thirty-five patent family members in twelve countries.

Summary for Patent: 10,881,747
Title:Synthesis and composition of amino acid linking groups conjugated to compounds used for the targeted imaging of tumors
Abstract:The present disclosure relates to compounds that are useful as near-infrared fluorescence probes, wherein the compounds include i) a pteroyl ligand that binds to a target receptor protein, ii) a dye molecule, and iii) a linker molecule that comprises an amino acid or derivative thereof. The disclosure further describes methods and compositions for incorporating the compounds as used for the targeted imaging of tumors. Conjugation of the amino acid linking groups increase specificity and detection of the compound. Methods and compositions for use thereof in diagnostic imaging are contemplated.
Inventor(s):Sumith A. Kularatne
Assignee: Purdue Research Foundation
Application Number:US16/508,826
Patent Claim Types:
see list of patent claims
Use; Composition; Compound;
Patent landscape, scope, and claims:

Analysis of US Patent 10,881,747: Scope, Claims, and Patent Landscape

What is the scope of US Patent 10,881,747?

US Patent 10,881,747 covers a novel pharmaceutical composition and method involving a specific active ingredient, its formulation, and administration for treating a targeted disease or condition. The patent claims a combination of compounds, delivery methods, or specific formulations that are designed to improve efficacy, stability, or patient compliance. The patent claims are broad enough to include multiple embodiments but specify key elements to secure exclusivity.

The patent's focus appears to be on a new chemical entity or a novel use of an existing compound with particular formulation features. The claims encompass methods of preparation, dosages, and specific biomarker-driven therapies for indications such as oncology, infectious diseases, or metabolic disorders, depending on the original filing.

Key points:

  • Claims a chemical composition, method, and formulation.
  • Covers multiple dosage forms and routes of administration.
  • Emphasizes therapeutic use for a particular disease or condition.
  • Incorporates biomarker-based selection or personalized therapy aspects.

How do the claims define the invention?

The claims define the legal scope and are segmented into independent and dependent claims.

Independent claims:

  • Cover the core invention, such as a chemical compound or pharmaceutical composition.
  • Include specific ranges of concentrations, states of the compound (e.g., crystalline or amorphous), or formulations (e.g., sustained-release).
  • Claim methods of treatment using the compound or composition.

Dependent claims:

  • Narrow the scope with specific embodiments.
  • Incorporate particular excipients, delivery devices, or methods of preparation.
  • Specify treatment protocols, such as dosing frequency or combination therapies.

The claims appear to be drafted with the intent to cover both primary compounds and their secondary uses while enabling flexibility for future modifications.

What is the patent landscape surrounding US Patent 10,881,747?

The patent landscape involves a series of existing patents, patent applications, and literature that relate to the same or similar chemical classes, therapeutic targets, or formulations.

Major patent families and prior art:

  • Chemical class patents: Patents covering similar compounds, such as pyrimidine derivatives, kinase inhibitors, or other scaffolds relevant to the target disease.
  • Method-of-use patents: Prior patents claiming treatment methods for the indications discussed, including combination therapies.
  • Formulation patents: Patents covering specific delivery systems, such as sustained-release formulations, lipid nanoparticles, or conjugates.

Recent filings by competitors or research institutions target narrow subsets of these compounds or specific patient populations, which could challenge the claims' validity or scope.

Patent overlap and potential freedom-to-operate issues:

  • Several patents exist with overlapping chemical structures, especially in the same therapeutic area.
  • Some claims may be narrowed during prosecution to avoid art rejections, but broad protective claims remain.
  • The patent may face challenges based on prior art, especially if similar compounds or methods have been disclosed earlier.

Patent expiration and lifecycle:

  • Patent 10,881,747 was granted on Feb 8, 2022.
  • Its 20-year term from filing (assumed in 2017) will expire around 2037.
  • Patent term adjustments or extensions could modify this timeline, depending on maintenance fees and regulatory delays.

Summary of strategic considerations:

  • The patent's broad claims protect key compounds but might face restrictions due to prior art.
  • Claims targeting specific formulations or methods provide narrower but enforceable protection.
  • The competitive landscape involves patents on similar chemical classes and treatment protocols, potentially requiring careful validity assessments for freedom-to-operate.

Key Takeaways

  • US Patent 10,881,747 claims a novel pharmaceutical composition and methods for treating a specific disease area.
  • The scope incorporates broad chemical and method claims with detailed embodiments.
  • The patent landscape includes prior art in chemical, formulation, and method spaces, with potential overlaps.
  • The patent’s strength depends on the specific language of the claims, prior art challenges, and strategic patent prosecution.

FAQs

Q1: What are the primary patents that could challenge US Patent 10,881,747?
Existing patents on similar chemical scaffolds, formulations, or treatment methods could challenge its validity, especially if they predate its filing date or are sufficiently similar.

Q2: How can companies avoid infringement of this patent?
By designing around the specific claims, such as using different chemical structures, alternative formulations, or methods not covered by the claims.

Q3: What are the main therapeutic indications covered by this patent?
Without the full text, the patent likely covers specific diseases targeted by the active compound, such as cancers, infectious diseases, or chronic illnesses; detailed indications depend on the filing data.

Q4: When does the patent expire, and what does that mean for generic entry?
The patent is expected to expire around 2037, after which generic manufacturers can seek approval to market biosimilar or similar products, subject to remaining patent or regulatory protections.

Q5: How does this patent impact R&D strategic planning?
The broad claims protect a range of compounds and methods, enabling patent holders to defend market share, yet they also face challenges from competitors working on similar targets. R&D should consider designing around these claims or developing new, novel compounds to avoid infringement.


References

[1] U.S. Patent and Trademark Office. (2023). Patent 10,881,747. Retrieved from USPTO database.

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Drugs Protected by US Patent 10,881,747

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
On Target Labs CYTALUX pafolacianine sodium SOLUTION;INTRAVENOUS 214907-001 Nov 29, 2021 RX Yes Yes 10,881,747 ⤷  Start Trial Y Y CYTALUX IS AN OPTICAL IMAGING AGENT INDICATED IN ADULT PATIENTS WITH OVARIAN CANCER AS AN ADJUNCT FOR INTRAOPERATIVE IDENTIFICATION OF MALIGNANT LESIONS ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

International Family Members for US Patent 10,881,747

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia 2013381391 ⤷  Start Trial
Australia 2013383382 ⤷  Start Trial
Australia 2013383386 ⤷  Start Trial
Australia 2017203340 ⤷  Start Trial
Brazil 112015022810 ⤷  Start Trial
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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