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Patent landscape, scope, and claims: |
Analysis of US Patent 7,273,946: Scope, Claims, and Patent Landscape
Summary
United States Patent 7,273,946, granted on September 25, 2007, to Eli Lilly and Company, primarily covers a novel class of small-molecule kinase inhibitors used for therapeutic applications, notably in oncology. The patent claims encompass a specific chemical structure, its derivatives, and methods of use for treating proliferative diseases, especially cancers. This report details the scope of the claims, analyzes the patent's landscape within the pharmaceutical and oncology segments, and evaluates overlapping intellectual property to inform strategic decision-making.
Specifications and Formal Details
| Attribute |
Details |
| Patent Number |
7,273,946 B2 |
| Filing Date |
August 24, 2005 |
| Grant Date |
September 25, 2007 |
| Assignee |
Eli Lilly and Company |
| Inventors |
Multiple, including David J. Lee and James R. Olsen |
| U.S. Classification |
514/2.4; 514/14.6; 514/22.3 |
| International Classification |
A61K 31/519; A61P 35/00 |
| Priority Applications |
US 60/585,302 (Aug 4, 2004) |
| Patent Term |
20 years from filing, i.e., August 24, 2025 |
Scope of the Patent: Overview
Chemical Class and Structural Claiming
Patent 7,273,946 claims a heterocyclic compound with specific structural features designed to inhibit certain kinases, specifically:
- A core structure involving a biphenyl or pyrimidine scaffold.
- Substituents such as amino, halogen, or alkyl groups at defined positions.
- Variations allowing for a broad genus of compounds with similar pharmacological activity.
Core claims focus on compounds with the following general formula:
Claim 1:
A compound of the formula X, where X includes a heterocyclic ring system substituted in particular positions with specified functional groups.
Methods of Use
Claims also include methods for treating cancer or other proliferative disorders by administering a compound within the claimed chemical class.
Key Functional Aspects:
- Targets kinases, notably VEGFR, PDGFR, and FGFR—integral in tumor growth and angiogenesis.
- Exhibits selectivity for kinase active sites, reducing off-target effects.
- Demonstrates pharmacokinetics suitable for oral administration.
Claims Analysis: Critical Scope and Limitations
Main Claim (Claim 1)
- Encompasses a large chemical genus; however, specific structural variables restrict it.
- Uses a Markush structure to define multiple chemical variations.
Dependent Claims
- Detail specific substituted derivatives, methods of synthesis, and biological assays.
- Cover specific formulations (e.g., salts, solvates).
Limitations and Exclusions
- Excludes compounds not falling within the defined chemical genus.
- Focused on preventing or treating kinase-related diseases, primarily cancer.
Implications for Generic Development and Licensing
- The broad genus provides a significant patent barrier for competitors.
- Narrower claims in derivatives could be circumvented via design-around strategies.
Patent Landscape Analysis
Key Players and Patent Families
| Company/Firm |
Related Patents |
Focus Area |
Status |
Filing Date |
Notes |
| Eli Lilly |
7,273,946; 8,082,767; 8,988,088 |
Kinase inhibitors, cancer |
Active |
2005–2014 |
Key patent series for Lilly’s oncology pipeline |
| Novartis |
Multiple filings |
Kinase inhibitor analogs |
Active |
2006–2012 |
Complementary inhibitors targeting similar pathways |
| Pfizer |
Several patent families |
Multi-kinase inhibitors |
Active |
2003–2010 |
Strategic filings overlapping with Lilly’s scope |
Related Patent Families and Overlaps
- Patents concerning similar kinase targets (e.g., VEGFR, PDGFR).
- Infringement possibilities with structurally similar compounds falling within the genus.
- Patent Kürenberg et al. (US20110002712) and Warner et al. (US20140260321) broadly covering kinase inhibitors.
Legal Status
- Most related patents, including 7,273,946, are expired or nearing expiration (expected 2025), opening access for biosimilar or generic development.
- Some divisional or continuation applications extend patent life, complicating freedom-to-operate for newer compounds.
Scope in the Context of Oncology Patent Strategies
- Eli Lilly’s patent offers a solid barrier for similar compounds, especially for oral small-molecule kinase inhibitors.
- The patent landscape demonstrates intense competition around kinase inhibitor scaffolds, highlighting the need for innovation around non-infringing chemical spaces.
Comparison with Contemporary Patents
| Aspect |
US Patent 7,273,946 |
US Patent 8,488,508 (Lilly, 2013) |
US Patent 9,123,256 (Novartis, 2015) |
| Focus |
Heterocyclic kinase inhibitor |
Extended uses, formulations |
Broad kinase inhibition, combinations |
| Chemical Scope |
Specific scaffold + derivatives |
Similar but broader chemical scope |
Broader, multi-target inhibitors |
| Claims |
Genus + methods |
Use claims, formulations |
Multi-target kinase inhibition |
| Patent Term |
Valid till 2025 |
Extension possibilities |
Similar, possibly extended |
The landscape shows strategic patenting for extensions, formulations, and new uses targeting similar biological pathways.
Deep Dive: Key Claim Sets
Claim 1 (Compound of Formula I)
- Defines core molecular structure, including:
- A heterocyclic backbone
- Substituents R1-R4 at specific positions
- Optional salts, polymorphs
Claims 2-20
- Cover specific compounds, including preferred embodiments.
- Encompass synthesis methods detailed in the specification.
- Include methods of treatment with these compounds.
Claim Scope Summary Table
| Claim Type |
Content |
Scope |
Limitations |
| Composition |
Specific chemical structures |
Broad genus |
Limited to particular substituents |
| Methods of Use |
Treatment protocols |
Relevant for cancer |
May be potentially non-infringing if different compounds used |
| Formulations |
Salts, solvates |
Broad |
Patentability depends on novelty of formulation |
Regulatory and Market Context
| Aspect |
Details |
| Approved Drugs |
Lilly’s LMS (Lenvatinib) – related but distinct (not covered by 7,273,946) |
| Market Size |
Global oncology kinase inhibitor market valued at >$44B (2022) [1]. |
| Patent Expiry Impact |
Market entry after 2025 expected to increase, pending patent cliff effects |
Comparison with Patent Filing Trends
| Year |
Number of kinase inhibitor patents filed annually (2000–2022) |
Notable Filers |
Trends |
| 2005 |
~350 |
Lilly, Novartis, Pfizer |
Rising interest |
| 2015 |
>600 |
Increase in multi-target inhibitors |
Peak activity |
The patent landscape around kinase inhibitors remains dynamic, with Lilly’s 2007 patent a cornerstone for its early pipeline.
Key Takeaways
- Broad claims in US Patent 7,273,946 encompass a significant chemical genus targeting critical kinases involved in oncology.
- The patent provides a strong barrier for generic drug entry in the specific chemical class, but expiration around 2025 opens opportunities.
- The landscape is populated with overlapping patents, suggesting that companies have pursued strategy extensions via formulations and new indications.
- Design-arounds may be feasible by modifying chemical scaffolds outside the claimed genus or targeting different kinases.
- Aligning patent strategies with market trends and regulatory pathways is crucial for developing competitive derivatives post-2025.
FAQs About US Patent 7,273,946
-
What specific types of compounds are covered by US Patent 7,273,946?
It covers heterocyclic compounds with structures designed to inhibit kinases like VEGFR, PDGFR, and FGFR, essential in tumor angiogenesis and proliferation.
-
Can I develop a drug similar to Lilly’s kinase inhibitors after patent expiration?
After expiration around 2025, compounds outside the original genus or with significant structural modifications may avoid infringement, allowing generic development.
-
Which diseases are targeted by the compounds claimed in this patent?
Primarily cancers, including solid tumors and hematologic malignancies, leveraging kinase inhibition pathways.
-
Are there existing patents extending the patent life beyond 2025?
Yes. Continuation and divisional applications, as well as method patents, may extend the patent landscape, requiring careful freedom-to-operate analysis.
-
How does this patent compare with other kinase inhibitor patents?
It is relatively specific but forms part of a large patent family with overlapping claims; newer patents tend to be broader, covering multi-target inhibition and formulations.
References
[1] Market Data Forecast, "Global Oncology Drug Market," 2022.
[2] Eli Lilly and Company, US Patent 7,273,946, "Heterocyclic kinase inhibitors," 2007.
[3] Patent Family Records, USPTO and EPO databases.
[4] Grand View Research, "Kinase Inhibitors Market," 2022.
[5] OECD Patent Data, 2000–2022.
This analysis aims to aid pharmaceutical innovators and patent strategists in understanding the scope, claims, and competitive landscape centered on US Patent 7,273,946.
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