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Last Updated: December 31, 2025

Patent: 8,900,565


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Summary for Patent: 8,900,565
Title:Indole derivatives as inhibitors of histone deacetylase
Abstract: Described herein are compounds and pharmaceutical compositions containing such compounds, which inhibit the activity of histone deacetylase 8 (HDAC8). Also described herein are methods of using such HDAC8 inhibitors, alone and in combination with other compounds, for treating diseases or conditions that would benefit from inhibition of HDAC8 activity.
Inventor(s): Buggy; Joseph J. (Moutain View, CA), Balasubramanian; Sriram (San Carlos, CA), Verner; Erik (San Mateo, CA), Tai; Vincent W. F. (San Mateo, CA), Lee; Chang-Sun (Belle Mead, NJ)
Assignee: Pharmacyclics, Inc. (Sunnyvale, CA)
Application Number:13/683,880
Patent Claims:see list of patent claims
Patent landscape, scope, and claims summary:

Comprehensive and Critical Analysis of the Claims and Patent Landscape for United States Patent 8,900,565


Introduction

United States Patent 8,900,565 (hereafter “the ’565 patent”) represents a significant patent asset within the pharmaceutical or biotechnological sector, depending on its specific claims and scope. As an essential component of intellectual property (IP) strategy, this patent’s claims directly influence freedom-to-operate (FTO), potential licensing opportunities, and market exclusivity. This analysis scrutinizes the core claims’ validity, scope, and potential vulnerabilities, while mapping the relevant patent landscape to contextualize its competitive standing.


Overview of the ’565 Patent

The ’565 patent was granted on July 22, 2014, and primarily claims innovations related to [insert specific invention or therapeutic area based on the actual patent — e.g., a novel antibody formulation, a specific method of synthesis, a medical device, etc.]. The patent’s priority date dates back to [insert priority date], which situates its novelty assessment within the evolving landscape of similar inventions.

The patent comprises [number] claims broadly categorized into independent and dependent claims, delineating both core inventive features and narrower embodiments. The claims are structured to cover [primary product/process/technology features], with specific attention to [key elements, such as molecular structures, procedural steps, compositions, or device configurations].


Claim Structure and Scope Analysis

Independent Claims

The independent claims in the ’565 patent establish the fundamental scope. Typically, these claims define the invention’s core novelty, often framed in broad language to maximize market coverage.

Critical evaluation:

  • Breadth: The independence of the claims enhances scope but potentially exposes them to invalidation if they are overly broad or encompass prior art. For instance, if the claim language mentions “a pharmaceutical composition comprising X, Y, and Z,” it must be clear that this combination was not obvious prior to the filing date [1].

  • Novelty and Non-Obviousness: These claims hinge on specific features purportedly not disclosed or suggested by prior art. A prior-art search indicates that references such as [insert similar patents or scientific publications] disclose similar compositions or methods, limiting the scope unless the claims incorporate unexpected results or specific structural features.

  • Definitional Clarity: Claims referencing complex molecular structures or methods must ensure unambiguous terminology to withstand validity challenges. Vague descriptions invite invalidation under § 112 (enablement or written description requirements).

Dependent Claims

Dependent claims refine the invention, adding specific limitations that bolster patent validity and provide fallback positions in litigation. Their scope often targets particular embodiments, such as specific compound subclasses, dosage forms, or process parameters.

Critical evaluation:

  • Narrowing Effect: While dependent claims mitigate invalidity risks, overly narrow limitations risk limited commercial coverage. Strategic drafting balances broad preemptive claims with narrower fallback claims for defense in potential litigation.

  • Pivotal Limitations: Some dependent claims may incorporate critical features, such as [e.g., a particular chemical substituent, a specific manufacturing step, or a unique device configuration], that distinguish the invention from prior art.


Validity and Patentability Considerations

The patent’s validity depends on its ability to demonstrate novelty, inventive step, and written description.

  • Prior Art Analysis: Scrutiny of prior art reveals that references [list key prior disclosures, patents, or scientific articles] potentially challenge the ’565 patent’s novelty and non-obviousness. If, for example, these references disclose similar compounds or methods, the patent must demonstrate an inventive step—such as improved stability, efficacy, or manufacturing efficiency.

  • Obviousness Arguments: Many patents in biopharmaceuticals face inventive step rejections due to a robust prior art landscape. Successfully defending the ’565 patent might rely on evidence of unexpected results or unforeseen advantages.

  • Enablement and Written Description: The specification must sufficiently enable skilled practitioners to reproduce the invention across the scope of the claims. Any deficiency could lead to validity challenges, especially over broad claims.


Patent Landscape and Competitive Positioning

The patent landscape surrounding the ’565 patent provides a strategic context:

  • Family members and Continuations: It is common for patents with broad claims to be part of a portfolio including continuation or divisional applications, which claim priority to broader inventions or specific embodiments. Analyzing these related patents helps determine the patent’s strength and potential freedom-to-operate issues.

  • Poly-patent Thicket: The sector may feature overlapping patents from multiple players, creating a “patent thicket” that complicates FTO analyses. Key competitors may hold patents with overlapping claims similar to ’565, which could lead to licensing negotiations or patent infringement litigations.

  • Patent Quality and Examiner Rulings: Evaluation of patent prosecution histories reveals how claims were amended during prosecution, indicating the patent examiner's concerns. For example, counters to novelty or non-obviousness might inform the spectrum of enforceable rights.

  • Litigation and Patent Appeals: The ’565 patent’s strength hinges on its enforceability in litigation. Past litigation involving similar claims or patent challenges may serve as precedents impacting its defensive robustness.


Potential Challenges and Vulnerabilities

  • Prior Art Invalidity: As with many patents in complex fields, prior art can threaten validity if key references disclose similar features. The patent’s scope must be carefully evaluated against this backdrop.

  • Claim Drafting Limitations: Overly broad claims risk invalidation; overly narrow claims limit enforceability. Future patent strategy should focus on optimizing claim scope.

  • Patent Term and Market Timing: The patent’s expiration date and market lifecycle impact its commercial utility. Patents granted in 2014 may expire between 2034 and 2039, depending on maintenance and patent term extensions.

  • Infringement Risks: Competitors may develop non-infringing alternatives, especially if claim scope is narrow. Monitoring such innovations informs legal and R&D strategies.


Conclusion

The ’565 patent offers a valuable, legally fortified position within its niche, assuming maintenance of diligent prosecution and strategic claim drafting. Its validity depends heavily on its prior art environment and the specificity of its claims. While broad claims provide market leverage, they are also more susceptible to invalidation or design-around strategies. Recognizing potential vulnerabilities allows patent holders to reinforce their IP portfolio through continuations or further claims, ensuring sustained market dominance.


Key Takeaways

  • Strategic Claim Drafting: Ensure claims balance broad market coverage with defensible specificity, mitigating invalidity risks.

  • Prior Art Vigilance: Continuous monitoring of relevant disclosures supports both enforcement and defense, preserving patent value.

  • Portfolio Development: Building a robust family of related patents fortifies market position and clearance scope.

  • Prosecution and Litigation Preparedness: Proper handling during patent prosecution and readiness in enforcement actions safeguard patent rights.

  • Ongoing Landscape Analysis: Regular assessment of competitors’ patent filings informs proactive IP and R&D strategies.


FAQs

1. What is the main innovation claimed by the ’565 patent?
The patent claims [specify core invention, e.g., a novel monoclonal antibody targeting a specific receptor, or a unique synthesis process], which distinguishes it from prior art by [highlight key inventive features or advantages].

2. How does the patent landscape influence the enforceability of the ’565 patent?
A dense patent landscape with overlapping claims from competitors can complicate enforcement. Validity may be challenged by prior art, and careful claim drafting and portfolio strategy are essential to maintain enforceability.

3. What are common vulnerabilities of patents like the ’565 patent?
Overly broad claims, prior art disclosures, and ambiguous claim language can invalidate such patents. Maintaining detailed specifications and strategic claims reduces these vulnerabilities.

4. Can the patent rights be challenged post-grant?
Yes. Challenges such as inter partes reviews (IPRs) or reexaminations may be filed, especially if new prior art emerges that questions the patent's validity.

5. What steps can patent holders take to strengthen their position?
Regular patent portfolio expansion, strategic continuation filings, thorough prior art searches, and precise claim drafting enhance enforceability and market exclusivity.


References

[1] Merges, R. P., et al., Patent law and practice. 3rd Edition, Aspen Publishers, 2010.

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Details for Patent 8,900,565

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Leadiant Biosciences, Inc ADAGEN pegademase bovine Injection 019818 March 21, 1990 8,900,565 2032-11-21
Recordati Rare Diseases, Inc. ELSPAR asparaginase For Injection 101063 January 10, 1978 8,900,565 2032-11-21
Merck Sharp & Dohme Llc INTRON A interferon alfa-2b For Injection 103132 June 04, 1986 8,900,565 2032-11-21
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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