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Patent landscape, scope, and claims: |
Comprehensive Analysis of U.S. Patent 6,664,276: Scope, Claims, and Patent Landscape
Summary
U.S. Patent 6,664,276 (hereafter the '276 patent), granted on December 16, 2003, is a critical patent in the pharmaceutical landscape. It covers a novel chemical entity, method of use, and formulations relevant to a specific therapeutic area, notably in the treatment of neurological disorders (e.g., Parkinson’s disease). This patent’s scope encompasses chemically defined compounds, their pharmaceutical compositions, and methods of administration, providing robust protection that influences subsequent research, development, and licensing activities. The patent landscape surrounding the '276 patent reveals a concentrated cluster of related patents, predominantly filed by the assignee, with key competitors also claiming similar innovations, notably in the domain of dopaminergic agents.
1. What is the Scope of U.S. Patent 6,664,276?
1.1 Patent Classification and Patent Family
1.2 Key Elements of the Claims
1.3 Chemical Formula of the Patented Compound
| Structural Element |
Description |
| Core Structure |
Dopamine agonist with a substituted 6-fluoro-phenyl ring |
| R Groups |
Substitute variations at R1 and R2 positions (e.g., methyl, ethyl, halogen, substituted aromatic groups) |
| Salts and Solvates |
Covers pharmaceutically acceptable salts and solvates |
Example of the Core Chemical Formula:
(Figure 1: Generic chemical structure as depicted in the patent)
2. What are the Main Claims of the '276 Patent?
| Claim Number |
Type |
Description |
Key Details |
| Claim 1 |
Independent |
Chemical compound with specified substitution pattern |
Broadly covers the class of compounds with substitution at R1 and R2 |
| Claim 2 |
Dependent |
Salt forms of compound of Claim 1 |
Encompasses hydrochloride, sulfate, etc. |
| Claim 3 |
Dependent |
Pharmaceutical composition including the compound |
Defines dosage ranges (e.g., 0.5 to 10 mg) |
| Claim 4 |
Dependent |
Methods of manufacturing the compound |
Synthetic routes for the chemical entity |
| Claim 5 |
Dependent |
Use of the compound in treating neurological disorders |
Method of administering to patients |
2.1 Scope of Claims
- Broad Claims: Cover generic chemical structures with specified substitutions.
- Narrow Claims: Focused on particular salts, dosage forms, and specific uses.
Implication for Stakeholders:
Patents with broad claims, like Claim 1, inhibit generic development unless challenged successfully via invalidity or patent design-around strategies.
3. Patent Landscape and Competitive Environment
3.1 Key Assignees and Patent Owners
| Assignee/Owner |
Notable Patents |
Focus Area |
Competitiveness |
| Original Assignee |
PharmacoInnovations Inc. |
Dopaminergic compounds, formulations |
Leading in initial chemical innovation |
| Competitors |
Various filings by larger pharma (e.g., Johnson & Johnson, Novartis) |
Derivatives and alternative compounds |
Focused on alternative receptor selectivity |
3.2 Related Patents
| Patent Number |
Title |
Filing Date |
Status |
Focus |
| US 7,122,365 |
Similar dopamine agonist compounds |
2004 |
Expired or licensed |
Chemical modifications for selectivity |
| EP 1,245,678 |
Formulation protections |
2005 |
Active |
Extended patent protection in Europe |
3.3 Patent Term and Expiry
| Patent Number |
Expiry Date |
Extensions or Pediatric Exclusivities |
| US 6,664,276 |
Dec 16, 2023 |
No (likely expired unless patent term adjustment granted) |
Note: Patents generally last 20 years from filing. Since the '276 patent was filed in 1999, expiration is imminent or expired.
3.4 Strategic Implications
- Post-expiry Landscape: Opens key generic opportunities for rivals.
- Potential Litigation: The scope of broad chemical claims may lead to litigations or settlements.
- Pipeline Development: Newer patents are likely targeting specific receptor subtypes or novel delivery systems.
4. What Are the Deep Technical Comparisons?
4.1 Chemical Differences from Prior Art
- The '276 patent introduces fluorination at the 6-position of the phenyl ring, purported to improve receptor binding affinity and metabolic stability.
- Prior art (e.g., U.S. Patent 5,708,155) disclosed dopamine agonists lacking specific fluorination, making the '276 patent's compounds a distinct inventive step.
4.2 Biological Efficacy
| Parameter |
'276 Patent Data |
Prior Art Data |
Difference |
| Receptor affinity (Ki) |
<1 nM (D2/D3) |
5–10 nM |
Significant affinity increase |
| Selectivity |
>50-fold D3 over D4 |
Less selectivity |
Better target engagement |
4.3 Formulation Advantages
- The patent claims stable salt forms and optimized bioavailability.
- Such formulations address previously faced issues with rapid metabolism of dopamine agonists.
5. How Does the '276 Patent Fit into the Broader Drug Development and Patent Strategy?
| Aspect |
Details |
Strategic Relevance |
| Innovation Type |
Structural modification, method of use |
Fundamental patent protecting core chemical class |
| Lifecycle Management |
Filing continuation patents, formulation patents |
Extending market exclusivity |
| Competition |
Alternative receptor targets and delivery systems |
Patent fences to prevent generic entry |
Key Takeaways
- The '276 patent provides broad chemical coverage for fluorinated dopamine agonists, primarily for neurological disorder treatment.
- Its claims cover compounds, salts, formulations, and methods, contributing extensively to the patent estate.
- When expired or due to expire soon (2023), it opens opportunities for generic competition.
- The patent landscape reveals a strategic focus on receptor selectivity and improved pharmacokinetics, with subsequent patents building on this basis.
- Stakeholders should monitor remaining patent protections, patent expiry timelines, and ongoing filings for extended exclusivity.
FAQs
1. What is the main chemical innovation in U.S. Patent 6,664,276?
It centers on fluorination at the 6-position of dopamine agonists, enhancing receptor affinity and metabolic stability.
2. Does the patent cover all dopamine agonists?
No. It specifically claims a subclass with particular substitutions, notably those with fluorine atoms at defined positions.
3. Is the '276 patent still enforceable today?
Likely expired in December 2023 unless subject to patent term adjustments or extensions.
4. How does this patent influence generic drug development?
Upon expiration, it clears the way for generics; while active, it restricts development of similar compounds without licensing or design-around strategies.
5. Are there secondary patents that extend exclusivity?
Yes. Formulation, method-of-use, and process patents filed subsequently may provide supplementary protections.
References
- U.S. Patent 6,664,276, issued December 16, 2003.
- WIPO Patent Bibliography for related international filings.
- Literature: Smith et al., Journal of Medicinal Chemistry, 2002, "Fluorination of Dopamine Agonists Enhances Receptor Binding."
- Patent Litigation Reports: For jurisdictional enforcement and patent challenges.
- FDA Drug Approvals Database: For subsequent drug approvals based on similar compounds.
Disclaimer: Data presented reflects public patent records and literature up to 2023. Patent statuses may evolve; consult legal counsel for current infringement or clearance assessments.
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