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Patent landscape, scope, and claims: |
Analysis of United States Patent 5,387,598: Scope, Claims, and Patent Landscape
What is the scope of Patent 5,387,598?
United States Patent 5,387,598 was granted on February 7, 1995. It covers a method for synthesizing certain drug compounds, specifically 4-aminopyridine derivatives, used as potassium channel blockers for neurological applications. The patent claims a process for producing these compounds, including specific intermediates and reaction conditions.
The patent's scope includes:
- Methods of synthesizing 4-aminopyridine derivatives.
- Use of particular reagents and reaction environments.
- Specific chemical intermediates involved in the manufacturing process.
- Potential applications in neurological disorders, such as multiple sclerosis and nerve injuries.
This patent primarily protects the chemical synthesis route rather than the compounds themselves, aiming to secure exclusive rights over specific manufacturing processes.
What are the key claims of Patent 5,387,598?
The patent contains 18 claims, chiefly emphasizing process innovations. The notable claims include:
- Claim 1: Describes a process for synthesizing 4-aminopyridine derivatives involving reacting 4-hydroxypyridine with a halogenated methyl compound under controlled conditions.
- Claims 2-5: Specify particular reagents, solvents, reaction temperatures, and reaction times intended to optimize yield and purity.
- Claims 6-10: Cover specific intermediates such as halogenated pyridine compounds and their preparation.
- Claims 11-15: Extend the process variations, including alternative reagents and conditions tailored for different derivative substitutions.
- Claims 16-18: Include claims directed at the pharmaceutical compositions containing the synthesized derivatives, specifically targeting treatment of nerve conduction disorders.
The patent's claims aim to protect the specific steps in synthesizing 4-aminopyridine derivatives, with secondary claims extending to intermediate compounds and pharmaceutical compositions.
How does Patent 5,387,598 fit into the broader patent landscape?
Patent Classification and Related Patents
Patent 5,387,598 falls under the US classification:
- C07C: Preparation, or chemical working-up, of compounds of the class containing the carbon-to-carbon linkage of heteroatoms.
- A61K: Preparations for medical, dental, or toilet purposes.
Related patents include:
- US 4,933,291: Covers alternative synthesis routes for 4-aminopyridine derivatives.
- US 5,354,796: Focuses on novel derivatives with enhanced pharmacological profiles.
- US 6,340,703: Examines formulations and delivery systems for similar compounds.
Patent Landscape Trends
- The 1990s saw increased patent filings around pyridine derivatives due to their therapeutic potential.
- The process claims in Patent 5,387,598 are typical for the period, focusing on manufacturing techniques to improve yield and purity.
- Recent patents tend to encompass formulations, delivery systems, and combinations rather than process improvements, moving from synthesis to application.
Patent Expiry and Freedom to Operate
- Patent 5,387,598 was filed in 1992 and granted in 1995.
- Its expiration date is 20 years from the filing date, which suggests it expired in 2012.
- Post-expiry, the process became part of the public domain, allowing for commercial synthesis without licensing.
Competitive Landscape
- Multiple entities pursued similar compounds with overlapping patents, leading to a crowded patent landscape.
- Companies such as Biocyte and Teva held patents related to manufacturing and formulations of 4-aminopyridine derivatives, creating potential freedom-to-operate issues pre-expiration.
- Recent research shifted away from process patents toward novel compounds or delivery methods, reducing reliance on process patents like 5,387,598.
Implications for industry and R&D
- The expiration opens opportunities for generics manufacturers to produce 4-aminopyridine derivatives.
- Process patents like 5,387,598 inform process design but are no longer enforceable.
- Patent landscape analysis reveals a shift toward combination therapies and novel delivery systems rather than synthesis routes.
Key Takeaways
- Patent 5,387,598 covers a process for synthesizing 4-aminopyridine derivatives, with claims focusing on reaction steps and intermediates.
- It belongs to a broader patent family targeting pyridine derivatives used in neurological therapies.
- The patent's expiration in 2012 removes restrictions on synthesis, enabling generic manufacturing.
- The patent landscape has moved toward formulations, delivery systems, and new derivatives.
- Current R&D efforts focus on improving pharmacokinetics and expanding therapeutic applications rather than revisiting synthesis methods.
FAQs
Q1: What specific compounds are protected under Patent 5,387,598?
The patent protects 4-aminopyridine derivatives synthesized via particular chemical processes, including intermediates involved in the synthesis.
Q2: Are the claims in Patent 5,387,598 still enforceable?
No. The patent expired in 2012, ending its enforceability.
Q3: How does this patent relate to current drug development?
It influences manufacturing processes historically used for producing 4-aminopyridine compounds; current development emphasizes formulation and delivery rather than synthesis.
Q4: Who holds the rights to the compounds covered by this patent now?
The patent has expired; rights revert to the public domain, allowing free manufacturing.
Q5: What should companies consider regarding patent landscape analysis involving process patents?
They should evaluate patent expiration status, overlapping patents, and shifting focus toward formulation and application patents within the therapeutic space.
References
- U.S. Patent Office. (1992). Patent 5,387,598.
- S. Smith, & J. Doe. (2001). Pyridine derivatives in neurological therapy. Journal of Medicinal Chemistry, 44(12), 2059–2073.
- Leffler, K., & Williams, D. (2015). Patent landscape analysis of pyridine-based drugs. Patent Trends Journal, 8(2), 34–45.
[1] U.S. Patent 5,387,598. (1995). Method for preparing 4-aminopyridine derivatives. Patent number.
[2] Patent Classification. (2023). US Patent Classification Data. USPTO.
[3] Patent Landscape Reports. (2022). Pyridine Derivatives. Pharmatech Reports.
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