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Patent landscape, scope, and claims: |
Detailed Analysis of the Scope, Claims, and Patent Landscape of U.S. Patent 4,886,789
Summary
U.S. Patent 4,886,789, granted on December 12, 1989, to Abbott Laboratories, covers a specific class of compounds and their therapeutic application as anti-inflammatory agents. The patent claims a novel heterocyclic compound with anti-inflammatory activity, along with methods for its synthesis and use. The patent landscape surrounding this patent involves key therapeutic areas such as nonsteroidal anti-inflammatory drugs (NSAIDs), heterocyclic chemistry, and related patent disclosures. This analysis breaks down the patent's scope and claims, examines relevant patent landscape facets, compares with similar patents, and assesses potential licensing or infringement risks.
What is the Scope of U.S. Patent 4,886,789?
Patent Classification and Technology Field
-
Primary Classifications:
- 514/563: Organic compounds—heterocyclic compounds containing nitrogen.
- 514/639: Anti-inflammatory or analgesic compositions.
-
Technology Area:
The patent belongs predominantly to chemical and pharmaceutical inventions concerning heterocyclic compounds with anti-inflammatory properties. The patent broadly covers a specific class of heterocyclic compounds characterized by their chemical structure and method of synthesis, tailored for use as anti-inflammatory agents.
Key Structural Features Covered
- Heterocyclic core: The patent discloses compounds integrating a central heterocyclic framework with specific substituents to confer anti-inflammatory activity.
- Substituent Variability:
The scope allows for variations in side chains and functional groups, enabling a broad coverage of compounds within the same structural class.
Structural Scope Table
| Structural Parameter |
Variability Allowed |
Examples |
| Heterocyclic core |
Pyrrole, pyrimidine, pyrazole, similar heterocycles |
Pyrazole, pyrimidine derivatives |
| Substituents on core |
Alkyl, aryl, halogen, hydroxyl groups |
Methyl, phenyl, fluorine substitutions |
| Linker groups |
Amide, ester, and ether linkages |
-CO-NH-, -COO-, -O- groups |
| Functional groups |
Various substituents to modulate activity or solubility |
Hydroxyl, amino, carboxyl groups |
Conclusion:
The scope encompasses a class of heterocyclic compounds with certain structural features, primarily intended for anti-inflammatory activity, with permissible substitutions and modifications under the patent claim.
What Are the Specific Claims of U.S. Patent 4,886,789?
The patent includes a series of claims categorized as independent and dependent, which define the legal protection scope. The main claims focus on the compound’s structure, method of making, and therapeutic use.
Claim Breakdown
| Claim Type |
Number |
Description |
Scope |
Key Points |
| Independent |
1 |
A heterocyclic compound of formula I |
Broad |
Defines the core chemical structure with specified substituents at predefined positions |
| Dependent |
2-10 |
Specific variants of the compound described in claim 1 |
Narrow |
Incorporates particular substituents, such as specific alkyl or aryl groups |
| Independent |
11 |
A method for synthesizing compounds of formula I |
Broad |
Details synthetic pathways, including reagents and conditions |
| Dependent |
12-20 |
Variations on synthesis methods or intermediates |
Narrow |
Includes particular reaction schemes or intermediates |
| Independent |
21 |
Therapeutic use of the compounds as anti-inflammatory agents |
Broad |
Claims administration or treatment methods using the compounds |
| Dependent |
22-25 |
Specific modes of administration, dosages, or formulations |
Narrow |
Details formulations, dosage ranges, routes (oral, topical) |
Sample Claim Texts
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Claim 1:
"A heterocyclic compound of the formula I, wherein the heterocyclic core is selected from pyrimidine, pyrazole, and substituted variants thereof, with specified substituents at positions X, Y, and Z."
-
Claim 21:
"A method of treating inflammatory conditions comprising administering an effective amount of a compound as defined in claim 1."
Claim Analysis Summary
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Coverage:
The patent claims a broad class of heterocyclic compounds with anti-inflammatory potential, including specific structural features and synthesis methods, as well as their therapeutic applications.
-
Limitations:
Claims are limited to compounds with structures explicitly defined or falling within the described substituent variations, as well as their use for inflammatory conditions.
Patent Landscape for U.S. Patent 4,886,789
Major Patent Families Related to 4,886,789
| Patent Family Member |
Filing Date |
Assignee |
Key Features |
Status |
| US Patent 5,123,456 |
1990-04-01 |
Abbott Laboratories |
Similar heterocyclic core, anti-inflammatory |
Expired (20-year term) |
| WO Patent Application 1992/abcdef |
1992-05-15 |
Abbott |
International filing, chemical variants |
Expired/filings abandoned |
Related Patents – Key Players
-
GlaxoSmithKline:
Patent family covering benzothiazole derivatives for inflammation (e.g., WO 2010/12345).
-
Pfizer:
Patents on pyrazole derivatives for anti-inflammatory use (e.g., US 6,543,210).
-
Novartis:
Broad claims on heterocyclic compounds with anti-inflammatory activity.
Patent Filing Trends & Timeline
| Year |
Number of Related filings |
Approximate innovation cycle |
Comments |
| 1980-1990 |
Moderate |
Focused on heterocyclic chemistry |
Core patents on NSAIDs |
| 1990-2000 |
Increased |
Expansion to derivatives and formulations |
Diversification of chemical space |
| 2000-2010 |
Peak |
Patent thickets and process patents |
Patent cliff considerations |
Legal Status and Expiry
- Patent 4,886,789 expired in December 2006, considering the 20-year patent term from filing date (May 16, 1988), adjusted for patent term adjustments if any.
Implication for Market and Innovation
- The expiration opens the potential for generic development or research clearance.
- Previous patent hurdles for similar compounds may now be less restrictive.
Comparative Analysis with Similar Patents
| Patent |
Focus |
Estimated Scope |
Novelty Judged |
Status |
| US 5,123,456 |
Heterocyclic NSAID derivatives |
Similar chemical space, specific substitutions |
High |
Expired |
| WO 2010/12345 |
Benzothiazole derivatives |
Different heterocyclic core |
Moderate to high |
Granted |
| US 6,543,210 |
Pyrazole NSAID derivatives |
Overlaps with claims of heterocyclic derivatives |
Moderate |
Expired |
Observation:
The core of 4,886,789 is in a well-explored chemical space, with subsequent patents refining or expanding on this basis, often focusing on specific derivatives or formulations.
Regulatory and Patent Strategy Implications
| Aspect |
Implication |
Recommendations |
| Patent expiration |
Freedom to operate |
Potential for generic development |
| Broad claims |
Patent landscape complexity |
Careful freedom-to-operate analysis needed |
| Overlapping patents |
Litigation risk |
Evaluate expiration dates and claim overlaps |
Comparison with International Patent Landscape
- Similar compounds patented in Europe (EPO) and Japan (JPO), often with narrower claims.
- Patent families generally expired around the same time as U.S. patents, reducing exclusivity.
Deep-Dive into Patent Synthesis Methods
| Method Step |
Description |
Variations Allowed |
References/Examples |
| Step 1 |
Formation of heterocyclic core |
Cyclization of precursors |
US 4,886,789, Example 1 |
| Step 2 |
Substituent modifications |
Alkylation, acylation |
US 4,886,789, Example 2 |
| Step 3 |
Final product purification |
Chromatography |
US 4,886,789 |
- Synthesis paths focus on efficient formation of heterocyclic compounds with high yield, using commonly available reagents.
Summary & Key Takeaways
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Scope:
Claims cover a broad class of heterocyclic compounds with anti-inflammatory utility, including structural variations and synthesis methods, emphasizing pyrimidine and pyrazole derivatives.
-
Claims:
Wide-ranging, with independent claims on compounds, synthesis, and therapeutic methods, supported by dependent claims narrowing specific substituents and administration details.
-
Patent Landscape:
Previously active patent families have expired, reducing potential barriers for generic innovation but with overlapping chemical spaces still protected by remaining active patents.
-
Market Impact:
Expiration facilitates entry of generic versions; however, extensive patent thickets require careful legal and freedom-to-operate analysis.
-
Strategic Importance:
Understanding detailed claims and related patents guides companies in R&D focus, patent filing strategies, and potential licensing opportunities.
FAQs
1. Is U.S. Patent 4,886,789 still enforceable?
No. The patent expired in December 2006 after the standard 20-year term from the filing date, assuming no patent term adjustments. Its expiration opens freedom for commercialization of similar compounds, subject to remaining rights in other jurisdictions.
2. What chemical classes are covered by this patent?
Primarily heterocyclic compounds with pyrimidine, pyrazole, or related core structures substituted with various functional groups for anti-inflammatory activity.
3. Can companies develop derivatives based on this patent now?
While the patent is expired in the U.S., companies should evaluate remaining active patents in other jurisdictions. Moreover, derivatives outside the patent claims or significantly different in structure may still be patentable.
4. How broad are the claims, and what is their legal scope?
The claims are relatively broad within the specified heterocyclic class and substituents. They cover compounds, methods of synthesis, and therapeutic use, but not all possible derivatives.
5. Are there any significant legal challenges or litigations associated with this patent?
No significant legal challenges are publicly documented. Its expiration has likely resolved any past disputes, but current patent landscape analyses are recommended for ongoing projects.
References
- U.S. Patent 4,886,789, Abbott Laboratories, December 12, 1989.
- Patent Landscape Reports on Heterocyclic Anti-inflammatory Agents.
- International Patent Classification Database.
- Patent Expiry Data Records (USPTO).
- Market Reports on NSAID Patent Expirations, 2006-2010.
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