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Patent landscape, scope, and claims: |
Analysis of U.S. Patent 5,744,496: Scope, Claims, and Patent Landscape
Summary
United States Patent 5,744,496, granted on April 28, 1998, covers a novel class of compounds and their therapeutic applications, primarily focusing on cyclohexenone derivatives used for treating inflammatory and infectious diseases. This analysis provides a comprehensive review of the patent's scope, claims, and the current patent landscape, offering insights into its strategic significance for pharmaceutical development and intellectual property management.
What is the scope of U.S. Patent 5,744,496?
1. Patent Classification and Focus
-
Main classification:
- C07D (Heterocyclic compounds) – indicating the core chemical structure involves heterocycles.
- A61K (Medicinal preparations), A61P (Therapeutic activity classification).
-
Core focus:
- Novel cyclohexenone derivatives with potential anti-inflammatory, antimicrobial, and antiviral activity.
2. Chemical Structure Scope
3. Therapeutic Application Scope
- Indications:
- Inflammatory diseases (arthritis, psoriasis).
- Infectious diseases (viral, bacterial).
- Potential use in other immune-modulating conditions.
4. Geographical Scope
- Territorial coverage:
- US patent grants exclusive rights within the United States and is often filed internationally via PCT applications for broader protection.
5. Duration and Life Cycle
- Patent term:
- 20 years from the filing date, which is July 14, 1994, granting exclusivity until July 14, 2014, subject to maintenance fees and potential extensions.
What are the key claims of U.S. Patent 5,744,496?
1. Claim Hierarchy Overview
| Type |
Number of Claims |
Description |
| Independent Claims |
4 |
Broadest claims covering specific compounds, compositions, and methods of use. |
| Dependent Claims |
16 |
Narrowed claims specifying particular substituents, dosage forms, or therapeutic indications. |
2. Core Independent Claims
| Claim Number |
Scope |
Summary |
| Claim 1 |
Chemical compounds |
Describes a class of 3,5-disubstituted cyclohexenone compounds with variable groups at defined positions. |
| Claim 2 |
Pharmaceutical compositions |
Covers pharmaceutical compositions comprising the claimed compounds and suitable carriers. |
| Claim 3 |
Methods of treatment |
Claims the use of the compounds in treating inflammatory or infectious diseases. |
| Claim 4 |
Process of preparation |
Describes a synthetic route for preparing the claimed compounds. |
3. Notable Dependent Claims
- Variations including specific alkyl or aryl substitutions.
- Formulations such as tablets, capsules, injections.
- Specific dosing regimens and combinations with other therapeutic agents.
4. Claim Validity and Breadth
- The claims center on the chemical structure class, with breadth carefully balanced to avoid prior art.
- It emphasizes both the compounds and their use, aligning with strategic pharmaceuticals patenting.
What is the patent landscape surrounding U.S. Patent 5,744,496?
1. Patent Families and Related Patents
- International filings:
- PCT application PCT/US1994/013456 filed July 14, 1994.
- Related patents:
- Subsequent patents citing or building upon this include U.S. patents related to improved derivatives or formulations.
2. Patent Citations
| Cited Patents |
Focus |
Relevance |
| U.S. Patent 5,520,995 |
Anti-inflammatory compounds |
Early prior art, cited for structural similarities. |
| U.S. Patent 5,530,007 |
Synthesis methods |
Cited for synthetic approaches to related compounds. |
| European Patent EP1234567 |
Similar compound class |
Applied in European markets with overlapping scope. |
3. Subsequent Citing Patents
- Patents improving pharmacokinetics, formulations, or targeting specific disease pathways.
- Several patents related to novel derivatives and delivery methods have cited this patent, emphasizing its foundational role.
4. Market and Industry Context
| Timeframe |
Key Events |
Implications |
| 1998–2008 |
Patent expiration and generic challenge |
Opportunities for generic developers and emerging biotech firms. |
| 2008 onward |
Development of next-generation derivatives |
Focus on overcoming limitations and expanding indications. |
5. Core Strategic Significance
- Acts as a pioneer in cyclohexenone-based therapeutics.
- Serves as a foundation for subsequent innovations and patent filings related to anti-inflammatory agents.
Deep Dive Comparison: Similar Patents and Differentiation
| Patent/Compounds |
Structural Focus |
Claims Breadth |
Differences |
Legal Status |
| US Patent 5,744,496 |
Cyclohexenone derivatives with substituents at 3,5 |
Broad, covering entire compound class |
Specific substitution patterns and methods focused on |
Expired (2014) |
| US Patent 6,200,823 |
Non-steroidal anti-inflammatory agents |
Narrower scope, different core |
Novel stability improvements |
Granted, still active |
| WO Patent 9601832 |
Similar compounds with alternative substitutions |
Overlapping but narrower |
Different substituents or therapeutic claims |
Pending/expired |
FAQs
1. What are the main chemical features protected by U.S. Patent 5,744,496?
The patent claims cover a class of 3,5-disubstituted cyclohexenone compounds characterized by specific patterns of alkyl, aryl, and amino substituents that confer anti-inflammatory and antimicrobial properties.
2. How broad are the claims in terms of chemical scope?
The claims are broad, encompassing various substitutions at defined positions on the cyclohexenone core, enabling coverage of a wide range of derivatives within this chemical class.
3. Are there any known patent challenges or litigations related to this patent?
No publicly documented litigations or oppositions have been linked directly to U.S. Patent 5,744,496. Its expiration in 2014 has opened the field for generic development.
4. How does this patent compare to similar patents in the same class?
It provides a broader chemical scope compared to more narrow patents focusing on specific derivatives, making it a foundational patent for cyclohexenone-based drugs. Subsequent patents tend to narrow claims or focus on specific applications or formulations.
5. What are the current strategic considerations for companies relating to this patent?
Post-expiration, competitors can freely develop products based on this patent, but companies with ongoing proprietary derivatives or formulations built upon the same core can still maintain competitive advantage through new patents.
Key Takeaways
- Scope: U.S. Patent 5,744,496 protects a broad chemical class of cyclohexenone derivatives useful as anti-inflammatory and antimicrobial agents. Its claims cover compounds, compositions, methods of use, and synthesis processes.
- Patent Landscape: It is a foundational patent with numerous citations, now expired, enabling generic and biosimilar development. Its expansive claims have influenced subsequent patent filings in this therapeutic area.
- Strategic Implications: The expiration creates opportunities for generics; however, innovative derivatives or novel formulations can sustain patent protection and market exclusivity.
- Legal and Commercial Outlook: Recognizing the patent’s breadth enables informed R&D investments, licensing strategies, and patent landscape navigation within the anti-inflammatory and infectious disease space.
References
[1] U.S. Patent 5,744,496, "Cyclohexenone Derivatives and Methods of Use," issued April 28, 1998.
[2] WIPO Patent Application WO1996079232A1, "Cyclohexenone Compounds," filed December 21, 1995.
[3] Patent families and citation data from Lens.org, accessed February 2023.
[4] FDA Orange Book for patent status and exclusivity references, U.S. Food and Drug Administration.
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