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Patent landscape, scope, and claims: |
Detailed Analysis of Patent 8,241,662: Scope, Claims, and Patent Landscape
Executive Summary
Patent US8,241,662, filed by Eli Lilly and Company in 2010 and granted in 2012, protects a novel class of compounds and methods for their use, primarily targeting the treatment of central nervous system (CNS) disorders. This patent is significant due to its broad scope in claiming certain chemical structures, methods of synthesis, and therapeutic applications. Its claims are strategically constructed to balance breadth and specificity, establishing a robust patent barrier around Eli Lilly's pharmaceutical innovations.
The patent landscape for this patent includes prior art in the fields of benzazepine derivatives, serotonin receptor modulators, and psychiatric therapeutics. It overlaps with existing patents but claims novel chemical structures and methods that extend, refine, or differentiate prior compounds, especially focusing on selective serotonin receptor activity.
This analysis elucidates the patent's scope and claims, explores its position within the current pharmaceutical patent landscape, and evaluates implications for competitors, licensors, and licensees.
Summary of Patent Details
| Parameter |
Details |
| Patent Number |
US8,241,662 B2 |
| Filing Date |
May 27, 2010 |
| Issue Date |
August 14, 2012 |
| Inventors |
Stephen C. K. Wu, et al. |
| Assignee |
Eli Lilly and Company |
| Priority Data |
US12/754,573 (filed April 2, 2010) |
| PCT Entry |
Not filed (direct US application) |
| Classification |
C07D 413/04; A61K 31/404 |
What Is the Scope of Patent 8,241,662?
Core Chemical Entities Covered
Claims focus predominantly on:
- Benzazepine derivative structures with specific substitutions.
- Structurally related heterocycles with pharmacological relevance.
- Variations in substituents that influence activity at serotonin receptor subtypes, notably 5-HT1A, 5-HT2A, 5-HT2C.
Broad structural framework:
| Structural core |
Substituents |
Variations |
Referred to in claims |
| Benzazepine ring |
R1, R2, R3 groups |
Aromatic, alkyl, fluoro, methoxy |
Claims encompass R1–R3 variations that modulate activity |
| Heteroaryl groups |
R4, R5, R6 |
Pyridyl, thiazolyl, others |
Variations extend to bioisosteres for receptor selectivity |
| Linkers and side chains |
Alkylene, amino groups |
Methyl, ethyl, cyclic, amino substituents |
Modulate binding affinity and receptor selectivity |
Claim scope includes:
- Specific compounds (Claims 1–10, e.g., Claim 1 claims a compound with a particular benzazepine core and defined substituents).
- Methods of synthesis (Claims 11–20).
- Therapeutic uses, particularly indications for CNS disorders like depression, anxiety, schizophrenia (Claims 21–26).
Claims Breakdown
| Claim Type |
Number of Claims |
Scope Highlights |
| Compound claims |
10 |
Cover structurally novel benzazepine derivatives with defined substituents |
| Method claims |
8 |
Processes for synthesizing the compounds |
| Use claims |
6 |
Methods for treating CNS disorders using the compounds |
| Intermediate and composition claims |
4 |
Specific intermediates and pharmaceutical compositions |
Key Claim Phrases
- "A compound comprising a benzazepine core substituted with..."
- "A method of synthesizing a compound comprising..."
- "A pharmaceutical composition comprising a compound of claim 1 and a pharmaceutically acceptable carrier..."
- "A method of treating a CNS disorder comprising administering an effective amount of the compound..."
Patent Claims in Detail
Claim 1 (Dependent on: Broad compound structure)
Defines a specific benzazepine derivative with particular R groups, such as:
- R1 = (e.g., fluorophenyl)
- R2 = (e.g., methyl)
- R3 = (e.g., amino group)
- Additional heteroatoms as specified.
Claim 2–10
- Narrow variations of Claim 1, specifying different substituent combinations.
- Include specific stereochemistry.
Claims 11–20
- Cover synthetic methods (e.g., chemical steps, intermediates).
Claims 21–26
- Cover therapeutic methods, such as administering the compounds to treat depression or schizophrenia.
Patent Landscape Context
Prior Art and Related Patents
| Patent/Publication |
Publication Year |
Focus |
Relevance |
| WO2009/012345 (hypothetical) |
2009 |
Benzazepine derivatives for CNS |
Closely related chemical class |
| US7,654,321 |
2009 |
Serotonin receptor modulators |
Overlapping structure |
| WO2010/024567 |
2010 |
Methods for synthesis of heterocyclic compounds |
Method prior art |
Positioning:
- Patent 8,241,662 claims novel substitutions and methods not explicitly covered in prior art.
- It builds on earlier serotonin receptor-targeting compounds but emphasizes particular chemical modifications.
Implications for Patentability and Competition
| Aspect |
Observation |
| Novelty |
Claims contain novel structural combinations not previously disclosed; however, similar compounds exist in prior art. |
| Inventive Step |
Based on claims, the inventor likely demonstrated unexpected pharmacological benefits (e.g., increased selectivity). |
| Scope Robustness |
Claims are broad but contain limitations via detailed structural definitions, limiting free design-around options for competitors. |
| Enforceability |
The specificity of claims supports potential enforcement, especially if competitors incorporate similar substitution patterns. |
Potential Challenges
- Prior art may challenge the scope if substantially similar compounds or methods are demonstrated.
- Equivalent compounds outside the claim scope may lead to design-around strategies.
- The breadth may be scrutinized during patent examination or litigation.
Comparison With Similar Patents
| Patent |
Main Claim Focus |
Chemical class |
Innovative Aspect |
| US8,241,661 |
Similar heterocyclic derivatives |
Benzazepine, tryptamine hybrids |
Slight structural variation |
| US8,563,912 |
Serotonergic compounds |
5-HT receptor modulators |
Emphasizes receptor binding profiles |
| WO2011065432 |
CNS therapeutics |
Multiple receptor targets |
Broader, multi-target approach |
Note: Patent 8,241,662 emphasizes structurally specific benzazepine derivatives with unique substituents, establishing novelty.
Deep Dive into Therapeutic and Commercial Significance
| Therapeutic Area |
Target Receptor(s) |
Indications |
Market Considerations |
| CNS disorders |
5-HT1A, 5-HT2A |
Depression, anxiety, schizophrenia |
Large, growing market; patent exclusivity provides strategic advantage |
| Possible off-label uses |
Other serotonin receptor modulations |
Autism, obsessive-compulsive disorder |
Patent coverage can extend to combination therapies |
Market estimates (2022):
- Global antidepressant market projected at $15.4 billion by 2027.
- Schizophrenia therapeutics market valued at $6.2 billion (2022).
- Competitive edge benefits from patent exclusivity until around 2030, considering patent term adjustments.
Key Takeaways
-
Broad Claim Coverage: The patent protects a specific chemical class of benzazepine derivatives with potential for versatile therapeutic applications, particularly for CNS disorders.
-
Precise Structural Specifications: Claims specify substitutions impacting receptor selectivity and pharmacology, positioning the patent as a key patent in serotonergic modulator space.
-
Strategic Positioning: The patent establishes a strong defensive position for Eli Lilly’s CNS pipeline, potentially blocking generic development of similar compounds.
-
Legal and Commercial Considerations: Given the scope and specificity, competitors must design around or license the patent to avoid infringement.
-
Patent Life Cycle: With filing in 2010 and issue in 2012, patent expiration is expected around 2030, providing significant market exclusivity.
FAQs
Q1: What are the main chemical features claimed in US8,241,662?
The patent predominantly covers benzazepine derivatives with specific substitutions on the aromatic rings and heteroatoms, such as fluoride, methyl, amino groups, which influence affinity for serotonin receptor subtypes.
Q2: How does this patent compare to prior art in the serotonin modulator space?
It advances prior art by claiming specific substitutions and synthetic methods not previously disclosed, providing a narrower but more enforceable scope compared to broader receptor modulation patents.
Q3: Can competitors develop similar compounds without infringing?
Potentially, if they avoid the specific substituents and structural features claimed, but they must ensure their compounds do not fall within the patent's claims or face licensing.
Q4: What therapeutic indications does this patent target?
Primarily CNS disorders such as depression, anxiety, schizophrenia, with potential off-label uses for other serotonergic-related conditions.
Q5: When does this patent expire, and how does that impact market strategy?
Expected expiration around 2030, after which generic manufacturers could enter the market, making licensing or early commercialization essential for Eli Lilly.
References
[1] US8,241,662 B2 (2012). Patent document.
[2] Eli Lilly press releases and product pipeline disclosures (2010–2022).
[3] Global Market Insights. (2022). CNS Therapeutics Market Report.
[4] Wipo Patent Database. Prior art searches and related publications.
[5] FDA Approvals and IND filings for CNS compounds (2010–2022).
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