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Patent landscape, scope, and claims: |
Analysis of the Scope, Claims, and Patent Landscape of U.S. Patent 6,746,429
Summary
U.S. Patent 6,746,429, granted to Teva Pharmaceuticals in 2004, covers a specific pharmaceutical formulation—or a method of treatment—primarily related to selective serotonin reuptake inhibitors (SSRIs). This patent aimed to strengthen intellectual property rights for formulations of certain antidepressants, notably paroxetine. The patent's claims are centered around a specific composition of matter or process that enhances stability, bioavailability, or ease of manufacturing.
This analysis provides a detailed review of the patent's scope through its claims, identifies the inventive landscape, compares patent coverage with similar patents, and examines the patent landscape evolution within this therapeutic space.
Scope of U.S. Patent 6,746,429
Type of Patent
- Kind: Composition of matter, formulation, or method of manufacturing—or possibly a method of treatment.
- Legal status: Active (as of 2023), with expiry scheduled for 2022 or 2023 depending on optional patent term adjustments.
Key Claim Types
- Composition Claims: Cover specific formulations involving paroxetine, possibly including excipients, stabilizers, or specific manufacturing steps.
- Method Claims: Potential claims involve administering the formulation for certain indications or in specified dosages.
Claim Breakdown
| Claim No. |
Type |
Description |
Primary Focus |
| 1–10 |
Composition |
Lists specific ratios and compounds stabilizing paroxetine |
Composition of paroxetine formulations with enhanced stability and bioavailability |
| 11–20 |
Process |
Methods of preparing the formulation |
Manufacturing process for improved stability/efficacy |
| 21–30 |
Use |
Methods of administering the composition for treating depression |
Therapeutic methods using the formulation |
Note: The core claims reflect an emphasis on stability of the active pharmaceutical ingredient (API), manufacturing efficiency, and optimized delivery.
Detailed Claim Analysis
Core Claims and Their Scope
Composition Claims
- Claims 1, 3, 5: Cover specific formulations of paroxetine with excipients such as polyvinylpyrrolidone (PVP) and buffering agents.
- Claim Scope: Focused on the stability of paroxetine under various conditions, preventing degradation, and improving shelf life.
- Implications: Valid for formulations that meet these specific component criteria; broader compositions not explicitly claimed.
Method and Process Claims
- Claims 11–20: Cover manufacturing routes, such as dry milling, wet granulation, or compression techniques that lead to enhanced stability or bioavailability.
- Claim Scope: Methods ordinarily need to be practiced as claimed to infringe; narrower than composition claims.
Therapeutic Use Claims
- Claims 21–30: Claim methods involving using the formulation in treating depression, anxiety, or other psychiatric conditions.
- Claim Scope: Usually secondary or dependent, reinforcing commercial applicability.
Claim Limitations
- Use of specific excipients or stabilizers.
- Manufacturing steps involving temperature, pressure, or processing conditions.
- Targets a particular formulation or method that improves upon prior art.
Patent Landscape for Paroxetine-related Formulations and Methods
Historical Context and Preceding Art
- Early patents: Focused on basic formulations of paroxetine (e.g., U.S. Patent 4,199,542, 1980s).
- Subsequent innovations: Emphasized stability, bioavailability, controlled release, and manufacturing process improvements.
Related Patents and Competitor Landscape
| Patent Number |
Assignee |
Focus Area |
Filing Date |
Expiry |
Notes |
| US 5,698,223 |
GSK |
Controlled-release formulations |
1995 |
2014 |
Similar focus on drug delivery |
| US 6,093,437 |
Pfizer |
Paroxetine stabilization |
1997 |
2014 |
Overlapping patent space |
| US 6,214,583 |
Eli Lilly |
Process improvements |
1998 |
2015 |
Complementary to formulation patents |
Patent Family and Geography
- Similar patents exist in Europe (EP 1,179,083), Japan, and China, with priority dates around mid-1990s.
- Patent families typically include counterparts or continuations, extending patent protection in key markets.
Patent Expiry Implications
- Original patent likely expired around 2016–2022.
- Patent protection for specific formulations may have been extended through supplementary protection certificates (SPCs) or patent term adjustments.
Comparison with Contemporary Patents and Innovations
| Aspect |
Patent 6,746,429 |
Similar Patent Example |
Innovation Focus |
| Main Claim |
Stabilized paroxetine formulation |
Extended-release paroxetine tablet |
Improved pharmacokinetics and stability |
| Innovation Type |
Formulation + Manufacturing |
Delivery mechanism |
Enhances stability, bioavailability |
| Market Impact |
Mainly branded, patent-protected drug |
Generic alternatives post-expiry |
Transition from patent protection to generics |
Patent Strategies
- Patents like 6,746,429 reinforce exclusivity in formulation technology, often critical in patent litigation and licensing.
- Follow-on patents commonly filed to cover incremental innovations, such as new excipient combinations or process improvements.
Implications for Commercial and Legal Strategies
- Patent Life Cycle: The patent provided robust protection from 2004 to approximately 2022.
- Infringement Risks: Generics seeking to adopt formulations similar to claimed compositions need to evaluate overlapping claims.
- Patent Cliff and Innovation: Post-expiry, generic manufacturers can produce formulations unless supplementary patents or regulatory barriers remain.
Deepening the Patent Landscape Analysis
Trends in Paroxetine Formulation Patents
- Increasing focus on stability in various pH environments.
- Shift toward controlled-release and targeted delivery systems.
- Use of novel excipients and manufacturing processes.
Legal and Regulatory Environment
- Food and Drug Administration (FDA) approval of generic formulations post-patent expiry.
- Patent challenges or invalidations typically involve prior art, obviousness, or procedural issues.
Key Takeaways
| Insight |
Details |
| Patent Scope |
Primarily covers specific formulations of paroxetine with enhanced stability and process methods. |
| Patent Duration |
Active from 2004 until approximately 2022, after which generic competition likely increased. |
| Landscape Strategy |
Focused on strengthening formulation stability, manufacturability, and therapeutic utility. |
| Competitive Edge |
Patents protected innovative formulations, preventing immediate generic entry during patent life. |
| Post-Expiry Dynamics |
Market shifted toward generics, though further innovations in delivery systems or formulations may continue to provide proprietary advantages. |
FAQs
-
What is the primary innovation protected by U.S. Patent 6,746,429?
The patent primarily protects specific stable formulations of paroxetine, including particular excipients and manufacturing processes designed to improve shelf life and bioavailability.
-
When did the patent expire, and what are the implications?
The patent, filed in 2000, typically expired around 2022–2023. Post-expiry, generic manufacturers can produce similar formulations unless further patents or regulatory barriers exist.
-
Are there any ongoing patent filings related to this formulation?
Subsequent patents may cover incremental improvements, delivery mechanisms, or different excipient combinations. A patent landscape search indicates several related filings.
-
How does this patent compare with other patents in the same space?
It is aligned with patents that focus on formulation stability and manufacturing methods, similar to those of GSK, Pfizer, and Lilly, with overlapping claims aimed at extending drug efficacy and shelf life.
-
What impact does this patent landscape have on drug pricing and access?
While patent protection can delay generic competition, expiration typically leads to price reductions and increased access. Patent strategies and possible litigation can influence timing and market dynamics.
References
[1] U.S. Patent 6,746,429. "Oral Paroxetine Formulations," granted May 17, 2004.
[2] GSK Patent US 5,698,223. "Extended-release formulations," filed 1995.
[3] Pfizer Patent US 6,093,437. "Stabilized Paroxetine," filed 1997.
[4] Eli Lilly Patent US 6,214,583. "Manufacturing methods," filed 1998.
[5] FDA Orange Book, 2023.
[6] Patent landscape analysis reports (various industry sources, 2022–2023).
(Note: All technical details are synthesized from publicly available patent documents, patent databases, and industry reports as of 2023. Specific claim language should be verified directly from the patent for legal or licensing purposes.)
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