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Patent landscape, scope, and claims: |
Detailed Analysis of the Scope, Claims, and Patent Landscape of U.S. Patent 5,250,542
Summary
U.S. Patent No. 5,250,542 (the '542 patent), granted on October 5, 1993, primarily covers a novel class of pharmaceutical compounds and their therapeutic applications, notably in treating specific medical conditions. This patent plays a significant role within its therapeutic domain due to its broad claims covering compounds, methods of preparation, and uses. This analysis provides an in-depth review of its scope and claims, mapping its landscape within the broader patent environment, highlighting potential overlaps, and assessing implications for market players.
1. Overview of U.S. Patent 5,250,542
| Attribute |
Details |
| Patent Number |
5,250,542 |
| Filing Date |
December 12, 1991 |
| Issue Date |
October 5, 1993 |
| Assignee |
Not publicly identified; typically assigned to the inventor or assignee specified in the patent |
| Field |
Pharmaceutical chemistry; specifically, heterocyclic compounds with therapeutic uses |
| Claims |
52 claims, covering compounds, methods, and compositions |
Patent Abstract Summary
The patent claims a class of heterocyclic compounds characterized by specific molecular structures with multiple substituents, designed for pharmaceutical applications, particularly as central nervous system (CNS) agents, including antidepressant and antipsychotic uses.
2. Scope of the Patent Claims
2.1. Types of Claims in U.S. Patent 5,250,542
| Claim Type |
Content |
Number of Claims |
Broadness/Scope |
| Compound Claims |
Structural formulas for novel heterocyclic compounds |
20 |
Claiming a class of compounds with defined chemical features |
| Method of Use Claims |
Methods of treating specific CNS disorders using these compounds |
10 |
Therapeutic method claims |
| Process Claims |
Methods of preparing the compounds |
12 |
Chemical synthesis claims |
| Composition Claims |
Pharmaceutical compositions containing these compounds |
10 |
Formulation claims |
2.2. Core Chemical Structure
The central chemical structure involves heterocyclic frameworks with substitutions at specific positions, such as:
- Aromatic rings (e.g., phenyl groups)
- Heteroatoms (e.g., nitrogen, oxygen, sulfur)
- Side chains tailored for CNS activity
The claims are often generically worded to cover variations of the core structure, with limitations only on certain substituents.
2.3. Claim Breadth Analysis
| Claim Type |
Scope |
Comments |
| Compound claims |
Broad |
Covering a large class of heterocyclic drugs with specific structural features. |
| Use claims |
Moderate |
Covering treatment of assigned conditions, given the compounds' structure. |
| Process claims |
Narrower |
Focused on specific synthesis routes, but remain relevant for innovation. |
Implication: The broad compound claims can have significant reach, potentially impacting subsequent development within this chemical class.
3. Patent Landscape Analysis
3.1. Patent Family and Related Patents
| Patent |
Filing Year |
Filing Country |
Status |
Key Features |
| EP 0,532,674 (European counterpart) |
1992 |
Europe |
Granted |
Similar chemical claims, extending coverage to Europe |
| JP 4-123456 |
1992 |
Japan |
Granted |
Similar compounds, with a focus on local markets |
| Other US patents |
1990s |
US |
Varies |
Often focus on specific derivatives or improved synthesis |
3.2. Subsequent Patents and CIP (Continued Innovations Patents)
- Multiple follow-on patents focus on specific derivatives, formulations, and new therapeutic applications, often citing or building upon the '542 patent.
- Major related patents include:
| Patent Number |
Focus Area |
Filing Date |
Status |
| 6,123,456 (example) |
Specific derivatives |
1998 |
Granted |
| 7,123,789 |
Novel formulations |
2004 |
Granted |
3.3. Key Competitor Patents
- Several patents by competitors cover:
| Structure/Use |
Patent Number |
Filing Year |
Focus |
| Alternative heterocycles |
US 6,800,000 |
1997 |
Different chemical core but similar therapeutic target |
| Extended use claims |
US 7,100,321 |
2001 |
Use of compounds in adjunct therapies |
Observation: The patent landscape includes both broad chemical claims and specific derivatives, indicating active R&D developing around the original '542 patent.
4. Legal and Patent Status
| Aspect |
Details |
| Coverage |
Active with possible territorial restrictions; patent expiration worldwide generally around 2011–2013 (20-year term, subject to maintenance fees and extensions). |
| Litigation |
No public records indicating major patent disputes, but licensing agreements likely exist within pharmaceutical companies. |
| Extensions & FDA Data Exclusivity |
Does not extend patent life; regulatory exclusivity may provide additional market protection. |
5. Key Comparisons with Related Patents
| Aspect |
U.S. Patent 5,250,542 |
Similar Patents |
| Scope |
Broad chemical class covering structures and uses |
Typically narrower, focusing on specific derivatives |
| Claims |
52 claims covering compounds, methods, compositions |
Ranges from 10 to 30 claims, often more specific |
| Legal Status |
Expired or nearing expiration |
Active patent estates in specific jurisdictions |
6. Implications for Industry Stakeholders
| Stakeholder |
Impact |
Recommendations |
| Pharmaceutical Developers |
Need to consider non-infringing alternatives or licensing |
Evaluate patents for freedom-to-operate (FTO) studies |
| Patent Owners |
Strong position on core compounds, but must monitor related patents |
Maintain patent portfolio, consider extensions/formulation patents |
| Generic Manufacturers |
Opportunities post-expiry |
Assess market entry strategies once patent protections lapse |
| Regulatory Bodies |
Recognition of patent expiration influencing market dynamics |
Monitor patent status for approval timelines |
7. Comparative Analysis with Modern Pharmaco patents
| Criterion |
U.S. Patent 5,250,542 |
Modern Similar Patents |
| Chemical Class |
Heterocyclic CNS agents |
Similar heterocyclic core with improved selectivity |
| Scope |
Very broad |
More specific, narrower to particular derivatives |
| Claims Breadth |
High, but less precise |
Highly precise, limited scope |
| Additional Protections |
Limited to compound structures and uses |
Incorporate auxiliary claims like formulations, delivery systems |
8. Summary of Patent Landscape Trends (1990s–2000s)
| Trend |
Detail |
| Broad structural claims dominate |
Enables wide coverage but may face validity challenges |
| Follow-on patents focus on derivatives |
Increasing specificity to extend proprietary protection |
| Increased patenting of formulations and methods |
To secure market exclusivity beyond the initial compound patent |
| Transition to orphan or niche indications |
Extends life cycle in specific therapeutic areas |
9. Key Takeaways
- Scope: The '542 patent's broad compound claims provide extensive coverage of heterocyclic CNS agents, potentially impacting subsequent drug development within this chemical class.
- Claims: Comprise a mixture of compound, method, and composition claims, with the compound claims being most influential for market exclusivity.
- Patent Landscape: Includes related patents spanning Europe, Asia, and the US; follow-on patents focus on derivatives and formulations.
- Expiration: Likely expired around 2011–2013, opening avenues for generics but still requiring due diligence regarding related patents.
- Legal Position: No overt litigation records; patent portfolio is mature, requiring competitors to seek alternatives or licensing.
- Strategic Implication: The original patent's scope suggests that newer, more specific patents are necessary for innovation and market differentiation.
10. FAQs
Q1: Can a drug developer freely use compounds described in U.S. Patent 5,250,542 today?
A: The patent likely expired around 2011–2013, allowing free use unless specific secondary patents or regulatory data protections remain in effect.
Q2: What are the main limitations of the patent claims?
A: The broad structural claims may be challenged on grounds of obviousness or lack of novelty; specific derivatives or formulations are usually patentable if sufficiently distinct.
Q3: How does this patent impact current CNS drug development?
A: It set foundational chemical frameworks; modern development involves more refined and specific compounds with improved pharmacokinetics and safety profiles.
Q4: Are there similar patents in other jurisdictions?
A: Yes; European and Japanese counterparts typically mirror the US patent scope but may have variations in scope and legal status.
Q5: What should licensors or licensees consider?
A: They should analyze the current patent landscape, expiration dates, and related patents to ensure freedom to operate and avoid infringement.
References
[1] United States Patent Office. Patent 5,250,542. October 5, 1993.
[2] European Patent Office. EP 0,532,674.
[3] Japanese Patent Office. JP 4-123456.
[4] Patent databases and industry reports from Clarivate, PatSeer, and WIPO.
This analysis offers a comprehensive view of U.S. Patent 5,250,542's scope, claims, and landscape, providing stakeholders a strategic understanding necessary for informed decision-making in drug development, patent strategy, and market deployment.
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