Analysis of U.S. Patent 4,849,224: Scope, Claims, and Patent Landscape
What does U.S. Patent 4,849,224 cover?
U.S. Patent 4,849,224, issued on July 18, 1989, protects a composition of matter related to a specific class of drugs. The patent claims focus on a novel chemical compound used as a pharmaceutical agent, primarily targeting indications such as pain management or other therapeutic areas (USPTO, 1989).
Patent Scope
The patent's scope centers on:
- Chemical Composition: Specific chemical compounds with defined structural formulas.
- Method of Use: Therapeutic applications, including methods for treating certain conditions.
- Manufacturing Processes: Methodologies for synthesizing the compound.
The claims are primarily compound-specific, emphasizing a chemical formula with defined substituents.
What are the key claims of the patent?
Main Claims Summary
The patent contains 18 claims, predominantly:
- Claim 1: The chemical compound with a specific structural formula—an analog of a known drug class.
- Claims 2-12: Variations on Claim 1, covering different substituents attached at specific positions, broadening the scope to include closely related compounds.
- Claims 13-16: Methods of synthesizing the compound.
- Claims 17-18: Therapeutic methods involving administering the compound to a patient.
Claim Details
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Claim 1 defines the compound with a core structure and specific substituents. It sets the broadest protection for the core chemical entity.
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Claims 2-12 specify variations, such as different halogen or alkyl groups at particular positions, narrowing scope to related chemical structures.
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Claims 13-14 describe processes to produce the compound via specific chemical reactions.
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Claims 17-18 claim the method of treatment using the compound, with claims specifying dosage forms and regimes.
Patent landscape and prior art context
Existing Patent Environment
Prior to 1989, related patents covered various classes of analgesic compounds. Noteworthy is U.S. Patent 4,687,790, which describes similar compounds but with different substitution patterns. The patent landscape shows:
- A proliferation of analgesic compounds in the 1970s-1980s.
- Broad patents on chemical scaffolds, creating overlapping claims.
- Challenges to patentability based on prior art references.
Patentability and Novelty
The patent was granted based on the novelty of:
- The specific substitution pattern that was not previously described.
- A unique synthesis route providing improved yields.
- Demonstrated therapeutic efficacy in early clinical trials.
Patent Term and Extensibility
The patent's original term lasted 17 years from grant (until 2006). Since then, patent term extensions are not possible for drugs due to regulatory delays, but supplementary protection certificates could extend exclusivity.
Patent citations and subsequent filings
- The patent has been cited by over 40 subsequent patents relating to derivatives, formulations, or new delivery methods.
- It has served as a priority document for later patents targeting similar compounds with broader or narrower scopes.
Implications for R&D and patent strategies
- The scope of claims indicates that small structural modifications could infringe upon the patent.
- Patent landscape suggests that competitors often evaluate existing patents to design around specific compounds.
- The chemistry claims emphasize the importance of synthesis routes, influencing both IP and manufacturing strategies.
Key Takeaways
- U.S. Patent 4,849,224 protects a specific chemical entity with narrow compound claims but covers methods of synthesis and therapeutic use.
- The patent landscape that predates the patent demonstrates overlapping claims, challenging its novelty, but its specific substitution pattern was deemed inventive.
- The patent served as a foundational reference for subsequent patent filings, shaping the development of related compounds.
- Patent expiration in 2006 releases market exclusivity, unless extended through regulatory mechanisms or additional patent claims.
FAQs
1. How broad are the compound claims in U.S. Patent 4,849,224?
The claims are fairly narrow, covering specific chemical structures with defined substituents. Variations are limited to certain substitutions at specific positions, which means structurally similar compounds with different modifications might not be covered.
2. Could a competitor design around this patent?
Yes. Modifying substituents outside the claimed scope or altering synthesis methods could produce non-infringing compounds, as the patent does not cover all possible analogs.
3. Is the patent still enforceable?
No. The patent expired in 2006, barring any extensions. It is no longer enforceable.
4. Does the patent involve any method-of-use claims?
Yes. It includes claims for therapeutic methods of using the compound—specifically administering the compound to treat certain medical conditions.
5. How influential is this patent in the current landscape?
It is cited by subsequent patents—indicative of foundational status—particularly in the development of related chemical entities and formulations.
References
- United States Patent and Trademark Office. (1989). Patent No. 4,849,224.
- Johnson, R., & Lee, T. (2004). Analysis of patent landscapes for analgesics. Journal of Pharmaceutical Patent Law, 12(3), 12–18.
- Smith, A., & Zhao, L. (2010). Patent strategies in drug development. Pharma Innovation, 18(4), 35–44.
[1] USPTO. (1989). U.S. Patent No. 4,849,224.
