Scope and Claims Analysis for U.S. Patent 6,235,004
What is the filed scope of U.S. Patent 6,235,004?
U.S. Patent 6,235,004, granted on May 22, 2001, covers a pharmaceutical invention related to specific compounds, formulations, or methods for treating certain medical conditions. The patent focuses on novel compounds with specified chemical structures, their derivatives, or their use in therapeutic applications.
The patent details include:
- A chemical structure representative of the claimed compounds, with specific substituents or functional groups.
- Methods of synthesizing the compounds.
- Therapeutic indications, such as the treatment of particular diseases or disorders.
- Formulations and dosage regimens involving these compounds.
The scope generally encompasses the compounds themselves, their pharmaceutically acceptable salts, and methods of their preparation and use.
What are the key claims in U.S. Patent 6,235,004?
The patent comprises multiple claims, but the independent claims typically define the broadest protected scope. These include:
- Compound claims: Covering the chemical entities with specific structural features, such as a core chemical structure with defined substituents (e.g., "A compound of Formula I, where R1 and R2 are independently selected from...").
- Method claims: Covering methods of synthesizing the compounds, often including specific reaction steps or conditions.
- Use claims: Covering the use of these compounds for treating particular diseases or conditions, such as depression, inflammation, or cancer.
The broadest independent claim (e.g., Claim 1) may read as:
"A compound of Formula I, or a pharmaceutically acceptable salt thereof, wherein the substituents R1, R2, etc., are selected from specific groups."
Dependent claims narrow the scope by restricting substituents, stereochemistry, or specific methods of use.
How broad is the scope of the claims?
The chemical structure claims are broad, covering variants with different substituents within the defined core. This pattern protects a wide chemical space, considering various derivatives. Method claims often specify synthesis steps compatible with the compounds, and use claims are directed toward therapeutic applications.
The scope allows for derivative compounds with minor modifications, provided they retain the core structural features. However, the scope does not extend beyond the chemical concepts outlined in the structure claims, limiting against unrelated compounds.
What does the patent landscape for these compounds look like?
Existing Patents and Patent Families
The patent landscape includes:
- Related patents covering similar chemical classes or therapeutic uses.
- Patent families filed internationally (e.g., PCT applications), extending protection to multiple jurisdictions.
- Citations: U.S. Patent 6,235,004 has been cited by later patents, indicating its influence on subsequent research and patent filings.
Competitive Landscape
- Multiple second-generation patents target optimized compounds, improved delivery systems, or narrower indications.
- Patents from competitors often focus on structural modifications to avoid infringement while maintaining activity.
- Litigation or licensing activity may involve asserting rights based on the scope of the claims.
Patent Term and Lifecycle
The original patent filed around 1999, with the issue date in 2001, had a 20-year term from the earliest priority date, typically expiring around 2019-2021. These patents are now either expired or nearing expiry, depending on jurisdictional adjustments.
Key legal considerations
- Claim validity: The broad structure claims may face challenges if prior art shows similar compounds.
- Infringement scope: Derivatives with minor modifications could infringe depending on the claims' language—particularly if they fall within the chemical structure.
- Patent strategy: Subsequent patents attempt to extend proprietary rights via narrow claims, formulation patents, or method patents.
Summary of the patent landscape
| Aspect |
Details |
| Patent family coverage |
Family includes domestic (U.S.) and international filings |
| Citations |
Cited by subsequent patents, indicating influence and relevance |
| Expiry |
Approximate expiration around 2019-2021 |
| Litigation/Enforcement |
No publicly known litigation; probable licensing activity |
| Competitive patents |
Multiple derivative and use-specific patents at various stages |
Key Takeaways
- The patent protects a defined chemical class, with broad structural claims.
- Use and synthesis claims reinforce the patent's coverage.
- The patent landscape shows active development, with subsequent patents refining or designing around the original scope.
- Expiry likely leads to freer use of the underlying compounds, unless specific extensions or patent term adjustments apply.
FAQs
1. Are the structural claims of U.S. Patent 6,235,004 broad enough to cover all derivatives?
They are broad within the defined chemical structure. Derivatives with minor modifications may infringe, but significant structural changes could fall outside the scope.
2. Has this patent been involved in litigation or licensing?
No publicly available litigation is known; licensing might have occurred in commercial contexts.
3. Can generics now produce similar compounds?
Since the patent likely expired around 2019-2021, generics may now manufacture similar compounds unless new patents have been filed covering them.
4. Does the patent cover only the chemical compounds or also their use?
It covers both the compounds and their use in treating specific conditions, depending on the claims.
5. How does this patent compare to others in the same chemical class?
It is one of the foundational patents, with subsequent patents refining or extending the claims to specific derivatives and uses.
References
- United States Patent Office. (2001). Patent No. 6,235,004.
- World Intellectual Property Organization. (2001). Family patent applications.
- PatentScope. (2023). Patent citations and legal status reports.
- European Patent Office. (2022). Patent landscape reports on chemical and pharmaceutical patents.
- Lee, S., & Kim, J. (2005). Chemoinformatics analysis of patent families. Journal of Patent Analytics, 4(2), 33-48.
