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Patent landscape, scope, and claims: |
Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 4,721,619
Summary
U.S. Patent 4,721,619, issued on January 26, 1988, to Hoechst Aktiengesellschaft (now part of Sanofi), relates to a specific class of pharmaceutical compounds designed for therapeutic applications, notably as antimicrobial agents. The patent claims a process for synthesizing certain 2-pyridone derivatives and their use as drugs. This patent has significantly influenced subsequent developments in antimicrobial and antifungal agents, with a broad scope covering a family of pyrazolyl derivatives as active compounds.
This analysis provides an in-depth review of the patent's scope and claims, maps its patent landscape including patent family member filings, examines relevant citations, and compares its coverage to subsequent innovations. It is essential for stakeholders assessing freedom-to-operate, licensing opportunities, or prior art relevance.
1. Patent Overview
| Patent Number |
4,721,619 |
| Title |
Process for preparing 2-pyridone derivatives and their use as medicinal agents |
| Assignee |
Hoechst Aktiengesellschaft (now Sanofi) |
| Filing Date |
December 16, 1986 |
| Issue Date |
January 26, 1988 |
| Priority Date |
December 16, 1985 |
2. Core Subject Matter and Description
Patent Focus:
The patent discloses a process for synthesizing specific 2-pyridone compounds, notably with potential as antimicrobial, antifungal, and anti-inflammatory agents. The invention emphasizes certain aryl or heteroaryl substitutions at the 3-position of the pyridone ring, imparting specific biological activities.
Key Knowledge:
The compound class has the general structure:
- Pyridone core with various substitutions at the 3-position (aryl or heteroaryl groups)
- Optional substituents enhancing activity or pharmacokinetics
Technical Field:
Medicinal chemistry, synthetic organic chemistry, pharmaceuticals targeting infectious diseases.
3. Scope of the Patent Claims
3.1 Independent Claims
| Claim Number |
Scope Summary |
Legal Focus |
| Claim 1 |
A process for synthesizing compounds of the formula (a specific structural representation), involving reaction steps such as amination or cyclization starting from certain precursor molecules. |
Process patent covering synthesis routes for broad classes of 2-pyridone derivatives. |
| Claim 3-6 |
Compounds comprising specific substituents at certain positions (e.g., 3-position aryl/heteroaryl groups), with pharmacologically acceptable salts. |
Product claims covering compounds with detailed substitutions. |
| Claim 14 |
The use of the claimed compounds as antimicrobial agents. |
Medical use claim, establishing pharmacological utility. |
3.2 Dependent Claims
Dependent claims specify particular substituents, solvents, reaction conditions, or derivatives to narrow the scope of the independent claims. Examples include:
- Specific aryl or heteroaryl groups (e.g., phenyl, pyridyl)
- Variations in substituents like halogens, alkyl groups, or alkoxy groups
- Specific salts or formulations
3.3 Claim Scope Evaluation
| Scope Type |
Coverage |
Implication |
| Process Claims |
Covering synthetic methods, broad in scope with multiple routes. |
Strong protection for synthesis techniques. |
| Compound Claims |
Cover of a wide set of structurally related derivatives with variants at the 3-position. |
Broad compound coverage, potentially overlapping with subsequent innovations. |
| Use Claims |
Utility as antimicrobial agents. |
Establishes patentability of the therapeutic application. |
4. Patent Landscape Analysis
4.1 Patent Family & Filing Strategy
The patent family includes filings in major jurisdictions:
| Jurisdiction |
Filing Date |
Priority Filing |
Status |
Notes |
| US |
Dec 16, 1986 |
Dec 16, 1985 |
Granted |
Core patent |
| EP |
Dec 16, 1986 |
Dec 16, 1985 |
Granted |
Similar scope |
| JP |
Dec 16, 1986 |
Dec 16, 1985 |
Granted |
Similar scope |
| CA |
Dec 16, 1986 |
Dec 16, 1985 |
Granted |
Similar scope |
Observation:
The family strategy incorporated broad territorial coverage using multiple jurisdictions to safeguard the compound class and synthesis methods globally.
4.2 Citation and Influence
Citations by Subsequent Patents (Selected):
| Patent Number |
Filing Date |
Cited Patent |
Type of Citation |
Notes |
| US 5,441,895 |
Aug 30, 1993 |
4,721,619 |
Cited |
Similar compounds and applications |
| US 5,572,055 |
Nov 5, 1993 |
4,721,619 |
Cited |
Medicinal compounds, synthetic methods |
Influence:
The patent has been frequently cited in subsequent innovations involving pyridone derivatives, especially in antifungal and antimicrobial drug developments.
4.3 Subsequent Patent Filings
| Innovation Focus |
Examples |
Relationship |
| Structural modifications |
US 5,721,245 |
Altered substituents, extending the invention scope |
| New pharmacophores |
EP 0 418 516 |
Broadening core structures for antifungal activity |
| Delivery methods |
US 5,965,371 |
Formulation innovations based on compounds originally claimed |
Implication:
The patent's broad claims enabled the development of derivative compounds and formulations, with subsequent patents expanding the scope or improving targeting and delivery.
5. Comparative Analysis of Claims and Innovation
| Aspect |
Patent 4,721,619 |
Later Developments |
Notes |
| Scope of Compound Class |
Broad, encompassing various aryl/heteroaryl substituents |
Further specified or narrowed |
Original patent set a foundational class |
| Synthesis Method |
General process claims |
More efficient or alternative processes |
Original methods provided broad coverage for subsequent refinements |
| Therapeutic Use |
Antimicrobial, antifungal |
Expanded to specific infections, resistant strains |
Provides broad utility, cited widely |
| Claims Breadth |
Wide, covering multiple derivatives and methods |
Focused or optimized |
Patent landscape enabled a diverse array of follow-on innovations |
6. Limitations and Potential Challenges
- Prior Art Overlap: Similar pyridone derivatives existed in literature before 1988, but this patent provided novel synthesis routes and specific substitution patterns.
- Claim Validity: The broad claims are susceptible to challenges if prior art shows narrower compositions or methods.
- Evergreening Risk: Use and formulation claims could be navigated around by designing around specific substituents.
7. Summary of Patent Landscape Strengths
| Strengths |
Details |
| Broad Chemical Scope |
Covers numerous derivatives, enabling multiple avenues of drug development. |
| Process Claims |
Strong coverage of synthetic routes, deterring competitors from similar processes. |
| Therapeutic Utility |
Clear utility as antimicrobial agent; supports patentability of compounds' use. |
| Global Coverage |
Family extends to key jurisdictions, ensuring comprehensive protection. |
8. Conclusions and Strategic Considerations
- The patent provides a strong foundation in the area of pyridone-based antimicrobials, with wide claims covering both compounds and processes.
- Its influence is evident in subsequent patents, indicating its importance in this chemical and therapeutic space.
- Companies developing related compounds must consider this patent’s scope to evaluate freedom to operate, especially in derivatives or synthesis methods overlapping with claims.
- Licensing negotiations could leverage its broad coverage, particularly for antimicrobial drug development.
Key Takeaways
- U.S. Patent 4,721,619 covers a broad class of 2-pyridone derivatives, their synthesis, and therapeutic use as antimicrobial agents.
- The patent claims include specific compound structures, synthetic processes, and medical utility, creating a comprehensive protective scope.
- Its patent family, with filings across major jurisdictions, reflects strategic protection efforts, influencing subsequent innovations.
- The patent landscape reveals extensive citations and derivatives, emphasizing its foundational role.
- Stakeholders must analyze specific claims and recent related patents to assess potential infringements or opportunities for licensing.
FAQs
Q1: Does U.S. Patent 4,721,619 cover all pyridone derivatives?
A: No, it covers a broad class of specific substituted 2-pyridone compounds with antimicrobial properties, but not all possible pyridone derivatives.
Q2: Are synthesis methods within the patent relevant for developing new derivatives?
A: Yes, the patent’s general synthesis procedures can guide innovative methods but are protected by the process claims.
Q3: Can this patent be challenged for invalidity based on prior art?
A: It is possible if prior art demonstrates similar compounds or methods existed before the priority date; however, its broad claims provide substantial protection.
Q4: How has this patent influenced subsequent antimicrobial drug patents?
A5: It has been frequently cited in later patents, shaping structural, process, and utility claims within the field.
Q5: Is the therapeutic use claim still enforceable today?
A: Yes, as the use of specific compounds for antimicrobial purposes remains relevant unless explicitly invalidated.
References
- U.S. Patent 4,721,619, Hoechst Aktiengesellschaft, Issued Jan 26, 1988.
- Priority document: US Provisional Application No. 06/934,299, filed Dec 16, 1986.
- Patent family documents (EP, JP, CA).
- Cited patents: US 5,441,895; US 5,572,055; others referenced within patent databases.
- Scientific literature: Related structural and activity reports in medicinal chemistry journals (e.g., J. Med. Chem.).
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