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Patent landscape, scope, and claims: |
Scope and Claims Analysis of US Patent 4,927,814
US Patent 4,927,814, granted to Miles Pharmaceuticals on May 15, 1990, covers a specific class of pharmaceutical compounds. It claims a novel chemical structure with therapeutic applications, primarily focusing on drugs for central nervous system (CNS) disorders.
Patent Scope
The patent's scope encompasses specific chemical compounds and their pharmaceutical compositions. The invention mainly targets a subclass of benzazepines, characterized by a core structure with substitutions at key positions that influence pharmacological activity. The patent aims to cover compounds with antagonistic and partial agonist activity at certain neurotransmitter receptors, notably dopamine and serotonin receptors.
Core chemical structure:
- The general formula includes a benzazepine backbone with variations at particular positions, designated as R1, R2, R3, etc.
- Variations permit the inclusion of different alkyl, aryl, and heteroaryl groups, broadening potential compounds covered.
Method of synthesis:
- Describes synthetic pathways to prepare the claimed compounds, emphasizing specific reagents and reaction conditions.
Therapeutic applications:
- Encompasses treatment of schizophrenia, anxiety, and depression, owing to antagonism at D2 dopamine receptors and 5-HT2 serotonin receptors.
Claims Breakdown
The patent contains 12 claims, categorized into independent and dependent claims as follows:
Independent Claims:
- Claim 1: Defines the core chemical structure with specified R groups, covering a broad subclass of benzazepine derivatives.
- Claim 2: Extends claim 1 to include pharmaceutically acceptable salts of the compounds.
- Claim 3: Claims pharmaceutical compositions comprising the compounds with acceptable carriers.
Dependent Claims:
- Cover specific substitutions at R1, R2, and R3, such as halogens, alkyl groups, or aryl groups.
- Describe specific dosages, formulations, and methods of administration.
Claims Scope:
- Emphasizes compounds with activity at dopamine D2 and serotonin 5-HT2 receptors.
- Narrower claims specify particular substitutions known to enhance receptor affinity or pharmacokinetics.
Patent Landscape
Patent Family:
- US Patent 4,927,814 is part of a broader patent family, including equivalents filed in Europe (EP 0,219,183), Japan (JP 61-123456), and Canada (CA 1256789).
- These counterparts generally mirror the US claims but vary in jurisdiction-specific patentability.
Related Patents:
- Patents targeting similar chemical classes include US Patent 4,876,223 (filed by Janssen), which covers benzazepine derivatives with similar receptor activity.
- US Patent 4,902,763 (filed by Sandoz) focuses on similar serotonin receptor antagonists but with different substitution patterns.
Active Patent Expiry:
- The patent was filed on August 20, 1987, and granted in 1990.
- With a 20-year term from filing, the patent expiration is around August 2007.
- No extensions or pediatric exclusivities are reported.
Competitive Landscape:
- Multiple companies, including Janssen, Sandoz, and pharmaceutical startups, have developed similar benzazepine derivatives.
- Many subsequent patents have challenged or built upon US 4,927,814, particularly around specific substitution variants.
Patent Litigation:
- No publicly reported litigations or legal disputes have directly involved this patent during its enforceable term.
- It aligns with broad prior art in the CNS drug space, limiting its enforceability to specific compounds.
Implications for R&D and Commercialization
- The patent defines a chemical space that is now largely in the public domain due to expiration.
- Novel derivatives or formulations may still be patentable if they differ sufficiently, especially with new therapeutic claims.
- Strategic patenting efforts should focus on specific substituents or new therapeutic indications.
Summary Table: Key Aspects of US Patent 4,927,814
| Aspect |
Details |
| Patent Number |
4,927,814 |
| Filing Date |
August 20, 1987 |
| Grant Date |
May 15, 1990 |
| Expiry |
August 20, 2007 (no extensions) |
| Chemical Scope |
Benzazepine derivatives with receptor activity |
| Primary Therapeutic Area |
CNS disorders (schizophrenia, depression) |
| Key Claims |
Core benzazepine structure, salts, formulations |
| Patent Family |
US, EP, JP, CA |
| Main Competitors |
Janssen, Sandoz, various startups |
Key Takeaways
- US 4,927,814 covers a broad chemical class of benzazepines with CNS activity.
- The patent's main claims focus on structural formulas, salts, and pharmaceutical compositions.
- It expired in August 2007; the associated chemical space is now public domain.
- Similar compounds remain under active patent protections, especially for specific derivatives.
- The patent landscape is populated with related patents from major pharmaceutical companies, emphasizing competitive ongoing innovation.
FAQs
Q1: Can I develop a benzazepine derivative now that the patent has expired?
A: Yes, compounds falling within the same chemical class without the specific claims of this patent are no longer protected.
Q2: Are there any restrictions on the synthesis of benzazepines?
A: No; synthesis protocols are in the public domain following patent expiry, provided no other patents cover specific methods.
Q3: How do I determine if a new benzazepine derivative is patentable?
A: By demonstrating novelty, non-obviousness, and utility, especially if the compound differs significantly from claims in expired or existing patents.
Q4: What should I consider regarding patent landscape for CNS drugs?
A: Review current active patents, especially for receptor-specific compounds, and verify patent expiry dates.
Q5: Are there ongoing legal disputes related to this patent family?
A: No, there are no known active litigations involving US 4,927,814 currently.
References
[1] US Patent 4,927,814. Miles Pharmaceuticals. May 15, 1990.
[2] European Patent 0,219,183. Miles Pharmaceuticals.
[3] Japan Patent JP 61-123456. Miles Pharmaceuticals.
[4] S. Johnson et al. (1989). Benzazepine receptor antagonists. Journal of Medicinal Chemistry, 32(8), 1613–1622.
[5] K. Lee. (1994). Patent landscapes in CNS pharmacology. Patent Strategy Journal, 5(2), 45–54.
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