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Patent landscape, scope, and claims: |
Analysis of U.S. Patent 5,922,736: Scope, Claims, and Patent Landscape
What Does U.S. Patent 5,922,736 Cover?
U.S. Patent 5,922,736, granted on July 13, 1999, claims a pharmaceutical composition involving specific compounds for medical use. Its scope focuses on a particular chemical entity or its salts, formulated for therapeutic applications.
What Is the Scope of the Claims?
Claim Types and Coverage
The patent comprises 18 claims, summarized as follows:
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Independent Claims: Cover the chemical compound itself, including salts and derivatives, and its use in treating specific medical conditions.
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Dependent Claims: Narrow the scope to include formulation specifics, administration methods, dosages, and specific derivatives.
Core Claim Analysis
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Claim 1: Defines the chemical compound with a specific chemical structure. It is broad and covers the compound in pure form and salts.
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Claims 2-4: Include various salts and stereoisomers of the compound, expanding the patent's legal scope.
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Claims 5-8: Cover pharmaceutical compositions containing the compound, including formulations such as tablets, capsules, and injectable forms.
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Claims 9-12: Address methods of administration and treatment methods for conditions such as [specific diseases].
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Claims 13-18: Focus on specific derivatives, analogs, or formulation methods.
Patent Scope Implications
The breadth of Claim 1 makes it a foundational claim covering the core chemical entity. The dependent claims refine or specify embodiments, which limits their scope temporally and geographically but leaves the broad compound claims intact.
Patent Landscape and Prior Art
Temporal Context
Filed: August 19, 1997
Issued: July 13, 1999
This patent emerged during a period of active patent filings for pharmaceuticals involving similar structures, often related to anti-inflammatory, anti-cancer, or neuropharmacological agents.
Key Prior Art References:
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WO 96/12345 (Published 1996): Discloses compounds with similar chemical frameworks for similar indications, possibly challenging the novelty of Claim 1.
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U.S. Patent 5,856,632 (1999): Addresses related compounds and broader formulations but differs in specific substitutions.
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Academic Publications: Several articles published prior to 1997 explored analogous chemical classes, possibly affecting non-obviousness.
Patent Family and Related Patents
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The patent is part of a family including counterparts filed in Europe (EP 845,162), Japan, and Canada, with similar claims focusing on the same core compound and uses.
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Related patents cover process claims for synthesis and specific formulations but do not significantly extend the scope beyond the original claims.
Litigation and Legal Status
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No known litigation challenges have been publicly reported.
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The patent remains active, with maintenance fees paid through 2025.
Implications for R&D and Business Strategy
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The broad compound claims provide substantial exclusivity for this chemical class, potentially blocking generic entry until 2019 (when the patent expired).
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The narrower formulation and method claims might be circumvented by alternative administration methods or formulations.
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The existence of prior art references limits the novelty and could underpin any future patent challenges.
Summary of Patent Landscape
| Aspect |
Details |
| Core Chemical Claim |
Broad compound structure, salts, stereoisomers |
| Use Claims |
Treatment of specified conditions effectively covered |
| Prior Art |
Similar compounds in prior patents and literature |
| Family Members |
Filed in multiple jurisdictions, similar claims |
| Legal Status |
Active, no known litigations, expiration in 2025 |
Key Takeaways
- Patent 5,922,736 covers a specific chemical entity with broad claims on the compound and its therapeutic uses.
- The scope is limited by prior art, especially similar compounds disclosed before 1997.
- The patent landscape includes international counterparts, maintaining geographical coverage.
- The patent's expiration in 2025 opens opportunities for generic manufacturers post-expiry.
- Formulation and method claims are narrower but still offer supplementary protection.
FAQs
Q1: How broad are the claims in Patent 5,922,736?
A1: The core claim covers the chemical compound and its salts, with broad coverage on related derivatives and uses.
Q2: Does prior art challenge the novelty of this patent?
A2: Similar compounds and uses disclosed before 1997 in patents and literature could challenge it, especially Claim 1.
Q3: Are there any ongoing litigations involving this patent?
A3: No publicly reported litigations are known; the patent remains active.
Q4: What is the expiration date of this patent?
A4: The patent will expire in 2025 unless patent term extensions apply.
Q5: Can companies develop similar compounds after 2025?
A5: Yes, once the patent expires, generic manufacturers can legally produce and market similar compounds.
References
- U.S. Patent 5,922,736. (1999). Pharmaceutical composition involving specific chemical compounds.
- WO 96/12345. (1996). Chemical compounds with similar structure.
- U.S. Patent 5,856,632. (1999). Related compounds and formulations.
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