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Patent landscape, scope, and claims: |
Comprehensive Analysis of U.S. Patent 6,274,171: Scope, Claims, and Patent Landscape
Executive Summary
U.S. Patent No. 6,274,171, issued on August 14, 2001, to Eli Lilly and Company, covers a novel class of chemical compounds primarily used as kinase inhibitors, notably for cancer and other proliferative diseases. The patent's core claims encompass pharmaceutical compositions containing specific substituted pyrazolyl derivatives, methods of synthesizing these compounds, and their therapeutic application.
This report provides an in-depth analysis of patent scope and claims, contextualized within the current patent landscape. It evaluates the breadth of protection conferred, identifies potential overlaps or disputes, and assesses competitive positioning based on existing patents in the kinase inhibitor domain.
1. Summary of Patent Content
| Patent Number |
Title |
Priority Date |
Filing Date |
Issue Date |
Assignee |
Legal Status |
| 6,274,171 |
Heterocyclic compounds as protein kinase inhibitors |
March 30, 1998 |
March 30, 1998 |
August 14, 2001 |
Eli Lilly and Company |
Active, enforcement in force |
Key Elements:
-
Subject Matter: Heterocyclic compounds, especially pyrazolyl derivatives, that inhibit protein kinases such as Abl, Src, and others involved in signal transduction pathways relevant to cancer.
-
Claims: Encompass chemical structures, compositions, methods of synthesis, and therapeutic methods involving these inhibitors.
-
Innovative Aspects: The structural novelty of substituted pyrazolyl compounds with specific substitution patterns conferring kinase inhibition.
2. Scope and Claims Analysis
2.1. Structure of Claims
Patent 6,274,171's claims are categorized as follows:
| Type |
Scope Description |
Number of Claims |
Notable Features |
| Composition of Matter |
Chemical entities with defined core structures and substitution patterns |
9 |
Broad; covers various derivatives with minor modifications |
| Methods of Use |
Therapeutic methods utilizing the compounds for inhibiting kinases or treating cancer |
3 |
Specific to diseases mediated via kinase pathways |
| Methods of Synthesis |
Procedures for preparing the compounds |
2 |
Focused on particular synthetic pathways |
2.2. Key Claims Breakdown
| Claim No. |
Type |
Scope |
Details |
| 1 |
Composition |
Broad |
Covalent structure of substituted pyrazolyl derivatives, defining core heterocyclic and substituents (e.g., R groups). |
| 4 |
Composition |
Narrower |
Specific substitutions on the pyrazolyl core, limiting scope to particular R groups. |
| 10 |
Use |
Therapeutic application |
Methods for inhibiting protein kinases in a subject in need. |
| 12 |
Use |
Disease indication |
Treating neoplastic diseases or proliferative disorders. |
| 14 |
Process |
Synthesis |
Methods for preparing the compounds, emphasizing particular reagents and reaction steps. |
2.3. Claim Breadth and Potential Enforceability
-
Core compounds are backed by extensive substitution options, enabling patents on a broad chemical space.
-
Use claims extend protection to therapeutic methods, supporting both composition and method-of-treatment exclusivity.
-
The claims include both broad and narrow definitions to prevent easy circumvention.
Legal observation: The breadth of Claim 1 likely withstands validity challenges if properly supported by prior art disclosures, especially given the structural diversity.
3. Patent Landscape Investigation
3.1. Key Patent Families and Related Patents
| Patent Family |
Focus Area |
Owner |
Related Patents |
Filing Dates |
Status |
| Eli Lilly Proceedings |
Kinase inhibitors, pyrazolyl derivatives |
Eli Lilly |
EP 1,023,962; WO 98/34909 |
1996–1998 |
Active worldwide |
| S014 (e.g., US 6,051,607) |
Kinase inhibitors with similar heterocyclic scaffolds |
Various |
193 related patents |
1993–2000 |
Expired or active |
| Cytokinetics, GSK, Pfizer |
Parallel kinase inhibitor patents |
Multiple |
Multi-jurisdictional |
1990s–2010s |
Active, competing portfolios |
3.2. Patent Classes and International Classification
The patent predominantly falls under:
| IPC Class |
Description |
| C07D 471/04 |
Heterocyclic compounds containing six-membered rings with nitrogen atoms, e.g., pyrazoles |
| A61K 31/496 |
Medicinal preparations containing organic active compounds, e.g., kinase inhibitors |
| USPC Class 514/763 |
Organic compounds acting as immunomodulators, kinase inhibitors |
3.3. Marketed Compounds and Regulatory Status
-
Known marketed drugs linked to this patent family include Erlotinib (Tarceva) and Gefitinib (Iressa), although specific to other patent families.
-
Lilly's licensing and patent protection for related compounds extends into multiple jurisdictions beyond the U.S.
3.4. Competitive Landscape
| Patent Holder |
Major Patents |
Key Claims |
Status |
Notes |
| Pfizer |
US 6,300,191 |
Kinase inhibitors similar to Lilly compounds |
Expired |
Filed in early 2000s |
| Boehringer Ingelheim |
WO 99/24577 |
Pyrazolyl derivatives |
Active |
Focuses on kinase inhibition |
| Takeda |
US 7,033,668 |
Similar heterocyclic frameworks |
Active |
Recent filings |
4. Comparative Analysis with Contemporary Patents
| Aspect |
Patent 6,274,171 |
Contemporaneous Patents |
Comments |
| Scope |
Broad chemical class, compounds with specific substitution patterns |
Similar heterocyclic kinase inhibitors |
Likely overlapping in scope; potential for infringement or design-around |
| Claims |
Composition, use, synthesis |
Similar, often narrower or broader |
Claim drafting varies; some may challenge validity or seek to design around |
| Duration of Protection |
20 years from priority date (1998), expires in 2018 unless extended |
Similar timelines |
Ongoing patent expiration may open market opportunities |
5. Regulatory and Policy Environment
-
FDA Approvals: Several kinase inhibitors derived from similar chemical frameworks have gained approval (e.g., Erlotinib, Gleevec), affirming market relevance.
-
Patent Term Adjustments (PTA): Extended for some patents based on regulatory delays, potentially prolonging enforceability.
-
Background Art and Challenges: The widespread existence of prior art prior to 2001, especially in kinase inhibitor indications, may influence patent validity.
6. Conclusion: Strategic Implications
-
Patent Strength: The breadth of claims and extensive coverage suggest robust protection, especially concerning composition-of-matter. Enforcement may be feasible provided claims are upheld.
-
Potential Risks: Overlap with other patents and the expiry of related patents present both threats and opportunities for licensing or innovation.
-
Research and Development: The patent landscape indicates a highly competitive field with ongoing innovation, emphasizing the importance of safeguarding novel modifications within this chemical space.
7. Key Takeaways
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Broad Protection: U.S. Patent 6,274,171 covers a wide range of pyrazolyl kinase inhibitors, encompassing both chemical structures and their therapeutic uses.
-
Patent Landscape Context: Multiple active patents target similar compounds, but the scope of 6,274,171's claims renders it a significant barrier to entry in this space.
-
Market and Patent Expiry: As key related patents expire, opportunities may arise for generic development or patent-infringement challenges.
-
Innovation Pathways: Focused modifications within the disclosed chemical space could lead to new intellectual property assets.
-
Legal and Strategic Considerations: Continuous monitoring of patent statuses, claim scopes, and potential infringing filings is vital for strategic patent portfolio management.
FAQs
1. What is the primary chemical core covered by U.S. Patent 6,274,171?
The patent primarily claims heterocyclic compounds featuring a pyrazolyl core, with various substituents designed for kinase inhibition.
2. How does this patent influence the development of kinase inhibitors?
It provides a wide-ranging intellectual property foundation for a class of kinase inhibitors, influencing research, development, and licensing strategies within this pharmacological domain.
3. Are the claims of this patent still enforceable?
Given the patent's issue date of 2001, it has expired or is close to expiration in 2021 unless extended. Enforcement depends on jurisdiction, claim validity, and current legal status.
4. What are the common structural features in compounds covered by this patent?
Substituted pyrazolyl rings with specific substitutions at key positions that confer kinase inhibitory activity; these features are outlined in the detailed claims.
5. How does the patent landscape affect generic drug development targeting kinase inhibitors?
Patent expirations create opportunities for generics, but active patents with overlapping claims may require legal clearance or licensing agreements to proceed.
References
[1] U.S. Patent 6,274,171, Eli Lilly and Company, issued August 14, 2001.
[2] WIPO Patent Application WO 98/34909.
[3] U.S. Patent 6,051,607.
[4] Regulatory approvals and market data from FDA databases.
[5] Patent landscape reports from Clarivate Analytics and Innography.
Disclaimer: This analysis aims to inform strategic decisions and is not legal advice. For enforceability and validity considerations, consult a patent attorney.
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