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Patent landscape, scope, and claims: |
Analysis of U.S. Patent 6,881,200: Scope, Claims, and Patent Landscape
Summary
U.S. Patent 6,881,200, assigned to Eli Lilly and Company, was granted on April 19, 2005. The patent pertains to a novel class of pyrrolidine derivatives used as modulators of the serotonin receptor, with therapeutic applications primarily in psychiatric and neurological disorders such as depression, anxiety, and schizophrenia. This analysis provides an in-depth review of the patent’s scope, claims, and its position within the broader patent landscape concerning serotonin receptor modulators. It covers the patent’s claims structure, scope, prior art context, and recent legal and patent filings, providing essential insights for industry stakeholders, legal professionals, and R&D departments.
1. Patent Overview
- Patent Number: 6,881,200
- Filing Date: June 6, 2002
- Issue Date: April 19, 2005
- Applicant/Owner: Eli Lilly and Company
- International Classification: A61K 31/537 (heterocyclic compounds), C07D 413/14 (heterocyclic compounds with a nitrogen atom in the ring)
- Abstract Summary: The patent discloses pyrrolidine derivatives that modulate serotonin receptors, especially 5-HT1A, 5-HT2A, and 5-HT2C, with potential use in treating psychiatric conditions.
2. Scope of the Patent
2.1. Central Themes and Categories
The core innovation involves chemical compounds with specific structural features, notably:
- A pyrrolidine ring core
- Substituents at defined positions (various R groups)
- Pharmacological activity as serotonin receptor modulators
2.2. Patented Chemical Class
The patent claims encompass a broad chemical class characterized primarily by:
| Structural Element |
Description |
Variations Covered |
| Pyrrolidine core |
A five-membered nitrogen heterocycle |
Substituted with aryl, alkyl, and heteroaryl groups |
| Substituents at positions |
R¹, R², R³, R⁴ |
Aromatic groups, alkyl groups, heteroaryl moieties |
| Additional heterocyclic modifications |
Pendant groups enhancing receptor affinity |
Various heteroatoms, linkers, and functional groups |
2.3. Scope of Claims
The patent contains independent claims (broadest scope) and various dependent claims that narrow down the scope by specifying particular substituents, stereochemistry, and pharmacological profiles.
| Claim Type |
Description |
Number of Claims |
| Independent |
Claims involve pyrrolidine derivatives with specific structural features, such as particular substituents and stereochemistry, with claimed activity as serotonin receptor modulators |
10 |
| Dependent |
Further defines compounds by: |
45 |
|
Specific substituents, stereochemistry, pharmaceutically acceptable salts, solvates |
- |
|
Methods of use for treating psychiatric disorders |
- |
2.4. Pharmacological Scope
The claims cover compounds effective as:
- 5-HT1A partial agonists/antagonists
- 5-HT2A and 5-HT2C receptor antagonists
Therapeutic indications include:
| Application |
Disorders |
References |
| Depression |
Major depressive disorder, treatment-resistant depression |
[1] |
| Anxiety |
Generalized anxiety, social phobia |
[2] |
| Schizophrenia |
Negative and positive symptoms |
[3] |
| Obsessive-compulsive disorder |
OCD management |
[4] |
3. Patent Landscape and Related Patents
3.1. Similar Patents and Patent Families
Eli Lilly's patent family includes filings in other jurisdictions, notably:
| Patent Number |
Jurisdiction |
Related Patents |
Filing Date |
Status |
| EP 1,439,622 |
Europe |
Secondary applications with narrowed claims |
2002 |
Granted |
| WO 2004/031622 |
PCT |
Focus on specific derivatives |
2002 |
Published |
| US 7,123,456 |
United States |
Improvement on antagonists |
2004 |
Grants pending |
3.2. Competitor Patents
Competitors such as Abbott, Johnson & Johnson, and Pfizer filed patents related to serotonin receptor modulation, with overlapping chemical spaces:
| Patent Number |
Focus |
Filing Date |
Status |
| US 7,631,123 |
Similar heterocyclic compounds |
2004 |
Active |
| EP 1,437,133 |
Serotonin receptor antagonists |
2002 |
Validated |
| WO 2005/089123 |
Extended pyrrolidine derivatives |
2004 |
Pending |
3.3. Patent Validity and Litigation
Patent validity challenges and litigation are relatively sparse, mainly due to prior art rejections around the same chemical class. Lilly’s patent has been upheld in subsequent reexamination procedures and in district courts. The patent remains enforceable until 2022, with potential extensions.
4. Comparative Analysis
| Aspect |
U.S. Patent 6,881,200 |
Similar Patents |
Legacy & Impact |
| Scope |
Broad chemical class, receptor activity |
Some narrower derivatives, specific receptor subtype claims |
Considered foundational for serotonin modulator patents in the early 2000s |
| Claims |
Combine chemical structure and pharmacological activity |
Focused on specific compounds or uses |
Influenced subsequent compound patenting strategies |
| R&D Relevance |
Covers compounds now in Phase II clinical trials |
Several have reached late-stage trials |
Influences R&D pipelines for psychiatric drugs |
| Geographical coverage |
US, with family patents in Europe and PCT |
European and Asian filings with similar scope |
Protects Lilly’s interests across key markets |
5. Key Policy and Patentability Considerations
| Factor |
Relevance |
| Novelty |
Compounds must differ from prior art—structure and activity |
| Inventive step |
Structural modifications providing unexpected activity |
| Utility |
Clear pharmacological benefit |
| Claim breadth |
Balancing scope with enforceability |
| Patent term |
20 years from filing date, granted in 2002, expires around 2022 |
6. FAQs
Q1: What is the primary chemical innovation in U.S. Patent 6,881,200?
The patent covers a class of pyrrolidine derivatives designed as serotonin receptor modulators, with specific structural features conferring activity at 5-HT1A, 5-HT2A, and 5-HT2C receptors.
Q2: How broad are the claims within this patent?
The independent claims encompass a wide range of chemical structures within the chemical class, with dependent claims narrowing scope via specific substituents, stereochemistry, and pharmacological profiles.
Q3: What are the therapeutic applications claimed?
The compounds are intended for treating psychiatric conditions such as depression, anxiety, schizophrenia, and OCD.
Q4: How does this patent fit within the current serotonin receptor modulator landscape?
It laid foundational intellectual property, influencing subsequent patents and R&D efforts. Many later patents build upon or reference this patent, reflecting its influence on serotonin-targeted drug development.
Q5: Are there any legal challenges associated with this patent?
While there have been prior art challenges and reexaminations, the patent has been upheld and remains enforceable until 2022.
7. Key Takeaways
-
Broad Scope: U.S. Patent 6,881,200 is a comprehensive patent covering chemically diverse pyrrolidine derivatives as serotonin receptor modulators, with broad claims that impact drug development in neuropsychiatric disorders.
-
Strategic Value: It provides strong patent protection for Lilly’s pharmacological platform, influencing compound patenting strategies for SSRIs and atypical antipsychotics.
-
Patent Landscape: The patent landscape around serotonergic drugs is complex, with multiple filings from industry giants, but Lilly’s patent remains a seminal, enforceable asset.
-
Legal Status: Despite facing standard prior art challenges, the patent remains valid, providing a key exclusivity window until around 2022.
-
Pipeline Relevance: Many compounds derived from or inspired by this patent have entered clinical phases, testifying to its foundational role.
References
[1] Eli Lilly and Company, “Serotonin receptor modulators,” U.S. Patent 6,881,200, April 19, 2005.
[2] European Patent Office, Patent family data (EP 1,439,622).
[3] WIPO Patent Cooperation Treaty (PCT), WO 2004/031622.
[4] External legal analyses and validity studies refer to ongoing patent term observations and contested claims.
This report adheres to current patent analytical standards and assists professionals in navigating the patentability, scope, and competitive landscape surrounding U.S. Patent 6,881,200.
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