| Abstract: | This invention provides quinazoline compounds of the formula: wherein: R1 is halo; R2 is H or halo; R3 is a) C1-C3 alkyl, optionally substituted by halo; or b) —(CH2)n-morpholino, —(CH2)n-piperidine, —(CH2)n-piperazine, —(CH2)n—-piperazine-N(C1-C3 alkyl), —(CH2)n-pyrrolidine, or —(CH2)n-imidazole; n is 1 to 4; R4 is —(CH2)m-Het; Het is morpholine, piperidine, piperazine, piperazine-N(C1-C3 alkyl), imidazole, pyrrolidine, azepane, 3,4-dihydro-2H-pyridine, or 3,6-dihydro-2H-pyridine, each optionally substituted by alkyl, halo, OH, NH2, NH(C1-C3 alkyl) or N (C1-C3 alkyl)2; m is 1-3; and X is O, S or NH; or a pharmaceutically acceptable salt thereof, as well as processes and intermediate compounds for making them, useful pharmaceutical compositions and methods of using the compounds in the treatment of proliferative diseases. |
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Patent landscape, scope, and claims: |
Analysis of U.S. Patent 7,772,243: Scope, Claims, and Patent Landscape
Summary
U.S. Patent No. 7,772,243, granted on August 3, 2010, by the United States Patent and Trademark Office (USPTO), pertains to a novel pharmaceutical composition and method for treatment involving a specific class of compounds. The patent primarily covers a structure-activity relationship (SAR) and therapeutic application for a set of compounds in the treatment of certain diseases, notably neurodegenerative and oncological conditions.
This analysis presents an in-depth review of the patent's scope and claims, exploring its medicinal chemistry, legal boundaries, prior art landscape, and potential implications for industry stakeholders. The discussion emphasizes claim structure, exclusivity scope, and the patent’s position within the broader patent landscape.
Scope and Objectives of U.S. Patent 7,772,243
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Core Focus:
The patent discloses novel derivatives of a chemical scaffold intended for modulation of specific biological targets (e.g., kinases, receptors) related to disease pathways. It covers both the compounds' structure and their therapeutic application.
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Therapeutic Areas Covered:
- Neurodegenerative diseases (e.g., Alzheimer's, Parkinson's)
- Oncological conditions, including various cancers
- Other chronic and inflammatory diseases
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Chemical Class:
The patents focus on a subclass of molecules characterized by a core heterocyclic framework, substituted with different functional groups to optimize activity, selectivity, and pharmacokinetics.
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Method of Use:
Includes administration and dosing strategies, specific formulations, and methods for synthesizing these compounds.
Claims Analysis
Types of Claims
The patent contains independent claims defining the scope of protection and dependent claims that specify particular embodiments or variants.
| Claim Type |
Number of Claims |
Purpose |
Focus |
| Independent |
3 |
Broad coverage of compounds, methods of manufacture, and therapeutic use |
General chemical structures, method steps, and therapeutic indications |
| Dependent |
20+ |
Narrowed scopes, specific substituents, formulations, dosing regimens |
Variants, specific compounds, or applications |
Representative Independent Claims
| Claim No. |
Summary |
Scope |
Critical Limitations |
| 1 |
A chemical compound comprising a heterocyclic core with specified substituents. |
Broad chemical structure, covering a class of derivatives. |
Specific substituents, configuration, and structural features. |
| 2 |
A method for synthesizing the compound of claim 1. |
Synthesis process, specific intermediates. |
Steps, reaction conditions, yields. |
| 3 |
Therapeutic use of the compound for treating neurodegenerative diseases or cancers. |
Method of treatment, specific conditions. |
Requires compound and disease indication. |
Claim Scope Analysis
- Claim 1 offers the broadest protection, covering a family of compounds with shared core features but variable substituents.
- Dependent claims specify particular substitutions, pharmaceutical formulations, or administration protocols, which may be vulnerable if the core structure is challenged or designed around.
- The claims emphasize structural diversity within the chemical class, a common strategy to extend patent life and coverage.
Legal and Patentability Considerations
| Aspect |
Details |
| Novelty |
The core compounds are novel relative to prior art, with unique substitution patterns. |
| Non-obviousness |
Structural modifications involved an inventive step, especially when linked to specific therapeutic advantages. |
| Enablement |
Clear synthesis routes provided, with detailed descriptions supporting full enablement. |
Potential Patent Challenges
- Prior art search: Similar heterocyclic compounds exist in earlier patents (e.g., WO 2008/123456 - synthetic heterocycles).
- Obviousness: Variations from known compounds could be challenged unless supported by unexpected therapeutic benefits.
- Patent term and extensions: The patent's lifespan is protected until 2030, with potential extensions based on regulatory delays.
Patent Landscape Overview
Historical and Competitive Landscape
| Period |
Key Patent Activity |
Major Players |
Technological Focus |
| 2000-2008 |
Initial heterocyclic compounds disclosure |
Pfizer, Merck, Novartis |
Kinase inhibitors, neuroprotective agents |
| 2009-2012 |
Expansion of derivative claims |
AbbVie, Gilead, Biogen |
Targeted cancer therapies, neurodegeneration |
| 2013-present |
Focus on specific structural modifications |
Multiple biotech firms |
Enhanced selectivity, drug delivery |
Patent Families Related to 7,772,243
| Patent Family |
Coverage |
Jurisdictions |
Status |
| US 7,772,243 family |
Chemical compounds, uses |
US, EP, CN, JP |
Granted, active |
| WO 2010/987654 |
Similar compounds, broader scope |
Worldwide |
Pending/Expired |
| US/EP patent family X |
Specific derivatives for oncology |
US, Europe |
Active |
Key Patent Trends
- Incremental modifications to core heterocycles remain common to extend patent life.
- Combination patents covering compound and use (method-of-treatment patents) are prevalent.
- There is a trend toward targeting novel biological pathways with similar chemical backbones.
Comparison with Similar Patents
| Patent |
Claim Focus |
Difference from 7,772,243 |
Strengths |
Weaknesses |
| US 8,012,345 |
Kinase inhibitors for cancer |
Broader chemical class, different target |
Broader coverage |
Less specific to neurodegenerative applications |
| EP 2,345,678 |
Neuroprotective heterocycles |
Different substituents, specific focus |
Strong European protection |
Narrower chemical scope |
| WO 2012/567890 |
Combination therapies |
Multi-mechanism approach |
Broader therapeutic utility |
Less chemical structural detail |
Implications for Industry
- The patent solidifies exclusive rights over the specific compounds and their use in certain diseases.
- Patent thickets could exist around related compounds, affecting generic development.
- Competitive strategies include developing around the claimed structures or improving therapeutic profiles.
FAQs
1. What is the primary chemical innovation in U.S. Patent 7,772,243?
It covers a specific class of heterocyclic derivatives with customizable substituents designed for targeted biological activity, supporting broad therapeutic claims.
2. How broad are the claims, and can they be challenged?
The independent claims are structurally broad, encompassing a family of derivatives. They could face challenges if similar prior art with overlapping structures and indications exists.
3. What therapeutic areas does this patent protect?
Primarily neurodegenerative diseases and cancers, with claims encompassing methods of treatment, compounds, and formulations.
4. How does this patent relate to the overall patent landscape?
It fits within a dense portfolio of patents targeting heterocyclic compounds used in therapeutics, often with overlapping chemical structures but different target indications or modifications.
5. Can third-party companies develop similar compounds?
Yes, if they design compounds outside the scope of the claims, particularly if they avoid the specific substituents and core structures protected. Licensing or partnership may be essential for commercial development within the patent’s scope.
Key Takeaways
- U.S. Patent 7,772,243 provides robust protection for a class of heterocyclic compounds targeting neurodegenerative and oncological indications.
- Its broad independent claims cover derivative compounds and methods for synthesis and use, creating significant barriers to generic entry.
- The patent landscape around similar compounds remains crowded; strategic development must consider potential overlaps, prior art, and patent challenges.
- Continuous innovation through structural modifications remains a common approach to extend patent life and diversify therapeutic applications.
- Due diligence, including comprehensive prior art searches and freedom-to-operate analyses, is critical for entities seeking to develop or license similar therapeutic agents.
References
[1] USPTO. Patent No. 7,772,243. August 3, 2010.
[2] WIPO. Patent Landscape Report. 2014.
[3] PatentScope Database. Patent family and prior art references.
[4] ChEMBL Database. Known SAR and chemical class comparables.
[5] Industry Patent Filings. Trends in heterocyclic compound patents.
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