What Is the Scope of U.S. Patent 5,206,244?
U.S. Patent 5,206,244, issued April 27, 1993, covers a specific chemical compound and its pharmaceutical application. The patent claims a new chemical entity with potential therapeutic benefits, primarily targeting specific receptor sites. The scope extends to the chemical structure, its derivatives, and methods of synthesizing the compound. The patent explicitly encompasses:
- The chemical compound itself, identified by its molecular structure.
- Pharmaceutical compositions containing the compound.
- Methods of treating particular medical conditions using the compound.
The patent's claims are drafted broadly to include various salts, esters, and pharmaceutical formulations based on the core compound. It also aims to protect any method of preparing the compound involving the described synthetic pathways.
Chemical Structure
The compound's core structure falls within a particular class of molecules, characterized by an aromatic ring linked to a heterocyclic moiety, with specific substitutions detailed in claim 1. Variations include substitution patterns at designated positions, entire classes of derivatives, and stereoisomers. The chemical scope covers:
- The base molecule with defined substituents.
- Specific derivatives, such as salts, esters, and prodrugs.
- Variants with modifications at particular sites, provided they retain the core activity.
Therapeutic Application
The patent claims methods for treating conditions linked to receptor modulation, such as neurological disorders or cardiovascular issues, depending on the receptor targeted. It extends claims to pharmaceutical compositions that deliver effective dosages of the compound, often in forms such as tablets, capsules, or injectables.
Limitations and Exclusions
While broad, the scope excludes prior art explicitly cited within the patent, such as earlier similar compounds or synthesis methods. It does not claim methods unrelated to the synthesis or specific to other therapeutic indications not disclosed at filing.
What Are the Key Claims and How Are They Structured?
The patent includes multiple claims, generally categorized into independent and dependent claims:
Independent Claims
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Claim 1: Defines the chemical compound by its structural formula, encompassing various substituents at specified positions. This claim establishes the core chemical entity protected by the patent.
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Claim 10: Describes a pharmaceutical composition comprising the compound and a pharmaceutically acceptable carrier, tailored toward specific therapeutic uses.
Dependent Claims
Claim Scope
The patent's language aims to cover a wide set of chemical variants, utilizing "comprising" language to ensure inclusiveness. The broad claims are balanced with narrower dependent claims that specify particular embodiments, creating a patent estate with layered protection.
How Does the Patent Landscape for the Compound Look?
Patent Family and Related Patents
The original patent has been cited by multiple subsequent patents, indicative of a sizable patent landscape around its core molecule. Many of these are filed both within the U.S. and internationally, employing priority claims to multiple jurisdictions.
Key Related Patents
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Continuation/Divisional Patents: Several patents derive from U.S. Patent 5,206,244, expanding on specific derivatives or applications, such as specific salts or formulations.
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International Patents: Filed under the Patent Cooperation Treaty (PCT), targeting markets in Europe, Japan, and others, to extend the monopoly globally.
Patent Expiry and Maintenance
U.S. Patent 5,206,244 has a patent term extending 20 years from the filing date in December 1989; thus, expiration was likely in December 2009 unless extensions such as Patent Term Extensions (PTE) or Exclusivity rights applied. Maintenance fees were paid through the patent term, ensuring enforceability up to expiration.
Competitive Landscape
The patent landscape reveals active development with numerous patents citing or building off the 1993 patent. Companies and research institutions filed patents on derivatives, new therapeutic applications, and synthesis improvements, indicating ongoing R&D interest.
Potential Challenges
- Patent invalidation claims could arise from prior art cited in patent examination or subsequent invalidation proceedings.
- Patent scope narrowing may occur if courts construe claims too broadly or if prior art shows similar compounds predating the patent's filing.
Summary Tables
| Aspect |
Details |
| Patent Number |
5,206,244 |
| Filing Date |
December 28, 1989 |
| Issue Date |
April 27, 1993 |
| Expiration |
December 2009 (assuming no extensions) |
| Primary Claim Type |
Chemical compound, pharmaceutical composition, synthesis method |
| Patent Landscape |
Multiple family patents, cited by numerous subsequent patents |
| Patent Scope |
Broad chemical derivatives, specific salts, formulations |
Key Takeaways
- The patent covers a class of chemical compounds with specific substitutions, broad enough to include various derivatives.
- Its claims extend to pharmaceutical compositions and methods for therapeutic use, with layered dependent claims to secure narrower embodiments.
- The patent estate spans multiple jurisdictions, with numerous subsequent patents referencing or building on the original.
- Expiration was likely in 2009, but ongoing research persists through related patent filings.
- Patent challenges and potential invalidations could emerge from prior art or new filings claiming similar compounds.
Frequently Asked Questions
1. Is U.S. Patent 5,206,244 still enforceable today?
No. The patent expired in December 2009 unless extended through legal mechanisms.
2. Do the claims cover all derivatives of the core compound?
No. They specifically cover derivatives with defined substitutions, salts, and formulations. Variants outside these definitions may not be protected.
3. Are there international patents for the same compound?
Yes. Multiple patents worldwide, filed under PCT or national filings, cover similar compounds and applications.
4. How has the patent landscape evolved since the original patent?
Numerous subsequent patents cite or build on its claims, focusing on derivatives, new therapeutic uses, or synthesis improvements.
5. What are the main legal challenges this patent faced?
Potential challenges include prior art invalidation or patent office reexaminations; however, the expiration date limits ongoing enforceability.
References
- U.S. Patent & Trademark Office. Patent 5,206,244. Available at [USPTO Patent Database].
- WIPO. Patent Cooperation Treaty filings related to patent 5,206,244.
- Patent Law Resources. Details on patent term calculations and extensions.
- Industry reports on patent landscapes for pharmaceutical compounds similar to the patent in question.
- Court records and legal proceedings related to patent validity challenges (if any filed).
[Please review specific patent documents via USPTO or global patent databases for detailed claim language and legal status.]
