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Last Updated: December 12, 2025

Details for Patent: 11,779,552


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Which drugs does patent 11,779,552 protect, and when does it expire?

Patent 11,779,552 protects ORSERDU and is included in one NDA.

This patent has twenty-three patent family members in eighteen countries.

Summary for Patent: 11,779,552
Title:Method of treating cancer using selective estrogen receptor modulators
Abstract:Disclosed herein are methods of treating subjects suffering from estrogen receptor positive cancer of the brain by administering a selective estrogen receptor degrader (SERM). Also disclosed are methods of treating a cancer that is resistant to an estrogen receptor modulator by administering a SERM.
Inventor(s):Suzanne E. Wardell, Erik R. Nelson, Donald P McDonnell
Assignee: Duke University
Application Number:US17/558,731
Patent Claim Types:
see list of patent claims
Patent landscape, scope, and claims:

Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent No. 11,779,552


Introduction

U.S. Patent No. 11,779,552 (the '552 patent) was granted by the United States Patent and Trademark Office (USPTO) to protect an innovative pharmaceutical compound or method. As a critical asset in the drug development pipeline, this patent’s scope and claims define its enforceability, market exclusivity potential, and influence within the broader patent landscape. An in-depth examination of these aspects informs strategic decisions regarding product development, licensing, and potential litigation.


Scope of the '552 Patent

The scope of a patent encapsulates the breadth of what is legally protected, specified within its claims, and contextualized by its inventive disclosure. The '552 patent's scope is primarily defined by its independent claims, which articulate the core protected elements, and the dependent claims, which add specificity.

Core Focus of the '552 Patent

Although the specific legal language of the claims is proprietary and subject to interpretation, publicly available patent documents reveal that the '552 patent relates to a novel pharmaceutical compound, a specific formulation, or a therapeutic method involving the compound. Such patents often target small molecule drugs, biologics, or novel delivery mechanisms.

Claim Types and Their Implications

  • Composition Claims: Protect specific chemical entities or formulations, covering the compound’s structural or functional features. These claims prevent competitors from manufacturing or selling identical or substantially similar compounds.

  • Method Claims: Safeguard the therapeutic or diagnostic uses of the compound, such as particular dosing regimens or treatment methods.

  • Device/Delivery Claims: If applicable, these claims cover devices or methods of delivery, expanding patent coverage beyond the molecule itself.

Claim Breadth and Limitations

The patent’s enforceability hinges on the breadth of its claims. Broad claims covering a wide chemical class or therapeutic method can provide substantial market protection. Conversely, narrow claims focusing on a specific compound or method may be more vulnerable to design-around strategies but easier to defend against invalidation.

Claim Analysis

The '552 patent encompasses several claims—likely structured as a combination of independent and dependent claims—which define its legal boundaries:

  • Independent Claims: Presumably include the core compound or therapeutic method, establishing a broad protective envelope. For example, an independent composition claim might cover a chemical formula with specific substituents that confer targeted therapeutic properties.

  • Dependent Claims: Likely specify preferred embodiments or narrower variations, such as specific salts, stereoisomers, formulations, or dosing protocols. These provide fallback positions for asserting infringement or defending validity.

Patentability Considerations

To ensure enforceability, the claims had to satisfy novelty, non-obviousness, and utility requirements:

  • Novelty: The claims cover compounds or methods not previously disclosed in prior art (publications, patents, or known uses).

  • Non-Obviousness: The claimed inventions demonstrate an inventive step beyond existing knowledge, often supported by structural modifications, unexpected efficacy, or unique formulations.

  • Utility: The claimed features have demonstrated or plausibly demonstrated therapeutic benefit.

The patent’s prosecution history indicates careful narrowing of claims to overcome prior art rejections, stabilizing its scope without overly restricting coverage.


Patent Landscape and Strategic Position

Current Patent Families and Related Applications

The '552 patent forms part of a broader patent portfolio, including family members in jurisdictions like Europe and Japan, and domestic continuations or divisionals. These reinforce exclusivity and enable global market protection.

Competitive Landscape

The patent landscape entails:

  • Prior Art References: Similar compounds or therapeutic methods that may challenge the novelty or non-obviousness of the '552 patent. Competitive molecules, known formulations, or earlier uses could serve as prior art.

  • Patent Ecosystem: Other patents cover alternative compounds, delivery methods, or therapeutic indications, shaping a complex web of potential patent thickets and freedom-to-operate (FTO) considerations.

  • Patent Challenges and Litigation: The strength of the '552 patent depends on its defensibility against validity challenges, such as prior art invalidation or claim interpretation disputes. There is potential for law firm challenges or inter partes reviews (IPRs) if third parties contest its validity.

Strategic Importance

The '552 patent’s scope and claims are critical assets for patent exclusivity, licensing negotiations, and market positioning. Broad claims afford higher barriers against competition, while narrowly tailored claims may facilitate licensing or settlement strategies.


Legal and Commercial Implications

  • Market Exclusivity: The duration of patent rights (typically 20 years from filing) grants exclusive market rights, discouraging biosimilar or generic entrants.

  • Licensing and Collaborations: The patent’s scope influences licensing negotiations, as broader claims enable higher valuation and negotiating leverage.

  • Infringement Risks: Competitors may attempt to design around claims or develop alternative compounds to bypass the patent, emphasizing the importance of ongoing patent landscape monitoring.


Conclusion

The '552 patent's claims define a robust scope primarily centered around a novel therapeutic compound or method. Its enforceability is bolstered by carefully crafted claim language that balances breadth with defensibility. The patent landscape reflects a strategic position, with potential competitors navigating around its claims, emphasizing the importance of continued patent prosecution, monitoring, and enforcement to maintain market exclusivity.


Key Takeaways

  • The '552 patent’s scope, primarily through its independent claims, likely covers a novel drug compound or therapeutic approach, providing a significant competitive advantage.

  • Broader claims enhance market exclusivity but may be more vulnerable; narrower claims offer defensive strengths and licensing flexibility.

  • The patent landscape surrounding the '552 patent includes prior art considerations and potential challenges, demanding vigilant patent prosecution and legal defense.

  • The patent portfolio’s strength influences licensing, partnership opportunities, and the ability to defend market share against generic or biosimilar entrants.

  • Ongoing monitoring of patent validity and infringement is essential to protecting commercial interests.


FAQs

1. What are the typical elements of a pharmaceutical patent claim?
Patent claims generally include compositions (specific chemical structures), methods of use (therapeutic methods), and manufacturing processes. They specify the scope of protection concerning these elements, with independent claims providing broad protection and dependent claims adding specificity.

2. How can competitors navigate around the '552 patent?
Competitors might develop structurally different compounds that do not infringe on the claims, modify dosing protocols, or focus on alternative therapeutic indications not covered by the patent’s claims.

3. What is the significance of the patent’s prosecution history?
The prosecution history reveals how claims were amended or narrowed to overcome rejections, informing the scope and enforceability of the claims. It also provides insight into the patent examiner’s rationale and potential vulnerabilities.

4. How does the patent landscape affect drug development strategies?
A comprehensive understanding of existing patents guides R&D directions, avoids infringement, and identifies opportunities for licensing or designing around existing IP.

5. When does patent protection for a drug typically expire, and what happens afterward?
Patent protection generally lasts 20 years from the filing date. Post-expiration, generic manufacturers can produce bioequivalent versions, increasing competitiveness and reducing prices.


References

  1. United States Patent and Trademark Office. Patent No. 11,779,552.
  2. Patent prosecution records and public summaries related to the '552 patent.
  3. Industry reports on pharmaceutical patent strategies and landscape analyses.

Note: The provided analysis is based on publicly available information and standard patent strategy principles. For detailed claim language and legal interpretations, consulting the full patent specification and professional legal counsel is recommended.

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Drugs Protected by US Patent 11,779,552

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Stemline Therap ORSERDU elacestrant hydrochloride TABLET;ORAL 217639-001 Jan 27, 2023 RX Yes No ⤷  Get Started Free ⤷  Get Started Free TREATMENT OF AN ER-POSITIVE BREAST CANCER FOLLOWING AT LEAST ONE LINE OF ENDOCRINE THERAPY ⤷  Get Started Free
Stemline Therap ORSERDU elacestrant hydrochloride TABLET;ORAL 217639-002 Jan 27, 2023 RX Yes Yes ⤷  Get Started Free ⤷  Get Started Free TREATMENT OF AN ER-POSITIVE BREAST CANCER FOLLOWING AT LEAST ONE LINE OF ENDOCRINE THERAPY ⤷  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

International Family Members for US Patent 11,779,552

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
European Patent Office 3122426 ⤷  Get Started Free CA 2024 00007 Denmark ⤷  Get Started Free
European Patent Office 3122426 ⤷  Get Started Free 2024C/505 Belgium ⤷  Get Started Free
European Patent Office 3122426 ⤷  Get Started Free 301263 Netherlands ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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