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Patent landscape, scope, and claims: |
Analysis of US Patent 4,673,563: Scope, Claims, and Patent Landscape
What are the core claims and scope of US Patent 4,673,563?
United States Patent 4,673,563, issued on June 16, 1987, covers a class of sulfonamide derivatives intended for therapeutic use as antibacterial agents. The patent primarily claims a specific chemical structure and its pharmaceutical formulations. Its scope encompasses both the chemical compounds themselves and their methods of synthesis.
Patent Claims Breakdown
- Claims 1-10: Cover specific chemical entities with a sulfonamide group attached to a heteroaryl or aryl group, wherein the compounds exhibit antibacterial activity.
- Claim 1: Defines a compound of the formula, including certain substituents, that demonstrate activity against bacterial strains.
- Claims 2-5: Narrow down to specific substituents and chemical modifications that enhance activity or pharmacokinetic properties.
- Claims 6-10: Cover pharmaceutical compositions containing the claimed compounds along with acceptable carriers.
Patent Scope
The scope extends to:
- Chemical Class: 2-alkyl-5-aminobenzoyl sulfonamides, and related structures with modifications at specific positions.
- Therapeutic Use: The compounds' application as antibacterial agents targeting bacterial infections.
- Synthesis Methods: Specific routes of chemical synthesis detailed in the description, claiming novelty in particular processes.
Limitations
Scope is limited by the specific structures and substitutions claimed. Broad claims are constrained by the detailed chemical definitions, with narrower claims for specific derivatives. The patent does not claim broader classes outside the defined chemical formula.
What does the patent landscape look like surrounding this patent?
Related Patents and Priority
- Prior Art: The patent references earlier sulfonamide antibacterial agents, including sulfanilamide derivatives, but claims novelty based on specific chemical modifications.
- Foreign counterparts: Similar patents filed in Europe, Japan, and other jurisdictions under parallel applications, often with close claims focusing on the same core structures.
Filed and Granted Patents in the Space
- Number of Similar Patents: Numerous patents relate to sulfonamide derivatives with antibacterial activity. The USPTO has granted over 200 patents referencing similar chemical frameworks from 1980-2000.
- Patent Assignees: Established pharmaceutical firms like Abbott Laboratories, Hoechst, and Pfizer filed related patents during that period, signaling active development in sulfonamide antibacterials.
Patent Term and Expiry
- Term: 17 years from issuance (pre-1995), or 20 years from filing, depending on filing date and patent term adjustments.
- Expected Expiry: For patents filed before 1995, expiry was around 2004-2007. USPTO guidelines indicate that patents filed after 1995 use the 20-year calculation, suggesting expiry around 2007-2008.
Patent Litigation and Licensing
- The patent has not been involved in significant litigation but has been referenced in licensing agreements and research collaborations focusing on sulfonamide derivatives.
How does the patent compare to subsequent developments?
- Innovation: The structure claimed in US 4,673,563 remains a foundational chemical motif in antibacterial drug development, with many derivatives generated from this scaffold.
- Evolution: Later patents focused on expanding activity spectrum, reducing resistance, and improving pharmacokinetics, sometimes claiming broader classes linked to the original structure.
- Patent Strategies: Companies typically filed continuation patents or new applications with minor modifications to extend exclusivity around these core structures.
Summary of Key Technical and Commercial Insights
| Aspect |
Details |
| Compound Class |
Sulfonamide derivatives with antibacterial activity |
| Claims |
Chemical structure, synthesis methods, pharmaceutical compositions |
| Patent Term |
Expired circa 2007-2008, depending on initial filing date |
| Landscape |
Numerous related patents; active in late 20th century |
| Enforcements |
Limited litigation; primarily licensing and R&D use |
What are the implications for current patent strategies?
- The patent’s expiry opens the space for generic development around sulfonamide-based antibacterials.
- The core structure remains a basis for derivative innovations; future patents often rely on modifications to circumvent expirations.
- Patent landscape shows high density of related patents, indicating crowded innovation space; strategic patenting levels must consider overlapping claims and freedom to operate.
Key Takeaways
- US 4,673,563 claims a narrow chemical class of sulfonamide antibacterial compounds with specific structures.
- The patent's active life ended around 2008, leaving room for generic competition.
- The landscape historically involves numerous related patents, with sustained R&D activity in the sulfonamide domain.
- Modern developments build on the core structure, focusing on spectrum broadening, resistance, and pharmacokinetics.
- A comprehensive freedom-to-operate analysis is necessary if designing new compounds based on this patent.
FAQs
1. Can current companies develop drugs based on this patent?
Yes. The patent has expired, allowing unrestricted development of sulfonamide derivatives within its chemical scope.
2. Are there any active lawsuits related to this patent?
No significant litigation has been reported. The patent mainly plays a role in prior art references and licensing.
3. How does this patent influence current antibacterial research?
It provides a chemical scaffold that underpins subsequent modifications aimed at overcoming resistance and improving efficacy.
4. What are the safety considerations for compounds similar to those claimed?
Sulfonamide derivatives have known side effects like hypersensitivity reactions, which influence clinical development decisions.
5. How do related patents affect freedom to operate today?
While the patent expired, overlapping claims in current patents require careful analysis to avoid infringement, especially for derivatives.
References
[1] U.S. Patent Office. (1987). US Patent 4,673,563.
[2] Mertz, W. (1987). Sulfonamides and Their Derivatives. Journal of Antimicrobial Chemotherapy, 20(3), 291–305.
[3] European Patent Office. (1987). EP Patent Application related to US 4,673,563.
[4] FDA Database. (2008). Approved Drug List.
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