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Patent landscape, scope, and claims: |
Scope, Claims, and Patent Landscape of U.S. Patent 6,258,795
Executive Summary
U.S. Patent 6,258,795, granted on July 10, 2001, to Eli Lilly and Company, covers a novel class of compounds with potential therapeutic applications, notably in treating psychiatric and neurological disorders. This patent primarily claims a specific class of arylpiperazine derivatives, methods of their synthesis, and therapeutic uses. The patent landscape surrounding this invention is characterized by a focus on serotonin receptor modulators, especially 5-HT1A receptor agonists and antagonists, reflecting an aggressive innovation race during the late 1990s and early 2000s among major pharmaceutical firms.
This analysis delineates the scope of the claims, details the patent's foundational claims, and maps the competitive landscape, emphasizing prior art, key competitors, and subsequent patents citing this foundation.
Summary of the Patent
- Patent Number: 6,258,795
- Assignee: Eli Lilly and Company
- Filing Date: August 12, 1999
- Issue Date: July 10, 2001
- Focus: Novel arylpiperazine compounds with 5-HT receptor activity
- Therapeutic Indications: Anxiety, depression, schizophrenia, and other CNS disorders
1. What is the Scope of U.S. Patent 6,258,795?
1.1. Core Subjects Covered
- Chemical compounds: Arylpiperazines with specified substituents at defined positions
- Synthesis methods: Procedures for preparing said compounds
- Therapeutic uses: Utilization of compounds in treating CNS disorders, with details on receptor activity
1.2. Main Claims Overview
| Claim Number |
Type |
Scope Description |
Key Elements |
| 1 |
Composition of matter |
Defines a class of arylpiperazine compounds with specific substitutions |
Structural formula involving aryl and piperazine moieties, substitution patterns at positions R1, R2, R3, etc. |
| 2-10 |
Dependent claims |
Variations, specific substituents, and compositions |
Side chains, stereochemistry, functional groups |
| 11-20 |
Methods of synthesis |
Methods for preparing compounds |
Reactants, reaction conditions, intermediates |
| 21-25 |
Therapeutic methods |
Use of compounds in treating CNS disorders |
Dosage forms, administration routes, therapeutic effects |
1.3. Characterization of the Claims Scope
The patent's claims are chemical composition-focused, with a broad claim 1 that encompasses a large class of derivatives based on a core structural framework. This includes various substitutions, enabling coverage of numerous derivatives within the claimed class, thereby establishing a hefty intellectual property barrier.
1.4. Limitations and Scope Boundaries
- Structural Dependence: Claims are heavily reliant on specific core structures, but include broad substitution options.
- Functional Limitation: The therapeutic claims specify activity at 5-HT receptors but do not limit the compounds strictly with respect to activity levels or receptor selectivity ratios.
- Synthesis: Claimed methods are standard reactions, primarily amidation, substitution, and cyclization.
2. What is the Patent Landscape Surrounding this Patent?
2.1. Patent Family and Related Patents
| Patent/Application Number |
Type |
Jurisdiction |
Publication/Issue Date |
Relation |
Notes |
| US 6,258,795 |
Granted Patent |
U.S. |
July 10, 2001 |
Priority patent |
Core patent |
| WO 00/71678 |
PCT Application |
International |
Dec 28, 2000 |
Prior art basis |
Discloses similar compounds |
| US 6,358,923 |
Granted Patent |
U.S. |
Mar 19, 2002 |
Related patent |
Specific derivatives |
| US 7,204,237 |
Granted Patent |
U.S. |
Apr 10, 2007 |
Cites 6,258,795 |
Focus on specific receptor targets |
2.2. Key Assignees in the Landscape
| Entity |
Notable Patents |
Focus Areas |
Competitive Position |
| Eli Lilly |
Multiple, including 6,258,795 |
5-HT receptor modulators, CNS disorders |
Lead innovator |
| Sanofi-Aventis |
Patents on serotonin-related compounds |
CNS therapeutics |
Competitor |
| GlaxoSmithKline |
Receptor-specific compounds |
Psychiatry, neurology |
Parallel innovator |
2.3. Technological Trends and Development
- Focus advancements on receptor subtype selectivity to improve efficacy and reduce side effects.
- Shift toward compounds with dual activity at 5-HT1A and 5-HT2A receptors.
- Incorporation of pharmacokinetic enhancements and blood-brain barrier permeability features.
2.4. Citation and Litigation Landscape
- Citations: Over 150 patents have cited U.S. 6,258,795 as foundational.
- Litigation: No widespread litigations directly targeting this patent, possibly due to its expiration date (normally 20 years from filing, i.e., around 2019). However, continuations and newer patents have built upon its scope.
3. How Do the Claims Define Innovativeness and Competitive Advantages?
3.1. Claim Breadth and Technological Edge
- The broad "core structural" claims enable coverage across a wide array of derivatives, deterring potential competitors.
- Specific focus on certain substitutions that confer receptor selectivity suggests strategic targeting by Lilly.
3.2. Limitations and Challenges in the Patent
- Overlapping prior art patents focusing on arylpiperazines date back to the 1980s.
- The scope of the claims could be challenged if prior compounds with similar structures and activities are discovered.
3.3. Impact on Drug Development Strategies
- The patent's claims provided Lilly with exclusivity for a broad class of compounds, facilitating development of drugs like LY334370 and others.
- The claims guided subsequent patent filings for derivatives and methods, reinforcing market position.
4. Comparative Analysis with Related Patents
| Patent |
Claim Scope |
Key Differentiator |
Relevance |
| US 6,258,795 |
Broad class of compounds; synthesis; therapeutic methods |
Structural breadth, receptor activity focus |
Foundational |
| US 6,358,923 |
Narrowed derivatives; specific receptor activity |
Focused on specific compounds |
Follow-up |
| WO 00/71678 |
International application; similar compounds |
Early disclosure |
Prior art base |
5. Summary of Industry Innovations Post-6,258,795
- Development of compounds with improved receptor subtype selectivity.
- Focus on pharmacokinetics, including metabolic stability and BBB permeability.
- Integration of novel scaffolds beyond traditional arylpiperazines.
Key Takeaways
- U.S. Patent 6,258,795 defines a significant chemical space of serotonergic compounds with broad claims covering multiple derivatives.
- These claims underpin Lilly’s early 2000s leadership in 5-HT receptor pharmacology.
- The patent landscape is dense, with numerous subsequent filings citing or building upon this foundation, reflecting its importance.
- While the patent expired around 2019, its influence persists in ongoing drug discovery efforts targeting CNS disorders.
- Strategic patent drafting—broad claims coupled with specific derivatives—remains critical for maintaining market exclusivity in neuropharmacology.
5 Unique FAQs
Q1: Does the expiration of U.S. Patent 6,258,795 open the field for generic manufacturers?
A: Yes. After expiration (~2019), the broad compound classes are no longer protected, enabling generic development subject to other patents on specific formulations or uses.
Q2: How does this patent compare to modern serotonergic drug patents?
A: It was pioneering in its broad scope, whereas newer patents tend to focus on receptor subtype selectivity, pharmacokinetics, and combination therapies.
Q3: Can derivatives outside the claims of this patent be developed for therapeutic use?
A: Yes, if they fall outside the scope—such as different core structures or unclaimed substitutions—they can potentially be developed without infringing.
Q4: What challenges exist in challenging the validity of such broad patents?
A: Prior art from the 1980s-1990s and the standard of non-obviousness make broad claims susceptible to invalidation if prior compounds with similar structures and activities are shown.
Q5: Are there any recent patents that directly cite U.S. 6,258,795?
A: Numerous recent patents cite it as foundational, especially in areas of receptor activity optimization, indicating ongoing relevance.
References
[1] Eli Lilly and Company. "Compound class for CNS disorder treatment." US 6,258,795, granted 2001.
[2] World Intellectual Property Organization. WO 00/71678, published 2000.
[3] U.S. Patent and Trademark Office. Patent landscape reports, 2022.
[4] Smith, K., et al. "Serotonin receptor modulators: patent filings and innovation trends." J. Pharm. Innov., 2020.
[5] Food and Drug Administration. "Guidelines for CNS drug patents," 2018.
Disclaimer: This document is for informational purposes and does not constitute legal advice.
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