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Patent landscape, scope, and claims: |
Summary
Patent 4,551,456 covers a novel drug compound and its method of use, primarily focused on treating a specific medical condition. The patent claims a chemical entity with specific structural features and includes method claims for administering the compound in certain dosages. The patent landscape indicates active filings and litigation, reflecting significant commercial interest and validation of technology.
What Does Patent 4,551,456 Cover?
Scope of the Patent Claims
The patent’s claims define a class of chemical compounds characterized by a core molecular structure with certain substitutions. The key features include:
- A specific heterocyclic ring system.
- Substitutions at designated positions on the heterocycle.
- Patent claims encompass both the compound itself and methods of use for treating a disease.
Main Claims Breakdown
- Compound Claims:
Cover a chemical compound with a specified molecular configuration. The claims specify various possible substitutions, providing a broad scope while maintaining the core structure.
- Method Claims:
Include administering the compound to a patient in a therapeutically effective amount to treat the targeted condition—likely a neurological or inflammatory disorder based on the compound class.
- Use Claims:
Extend to methods of using the compound for specific indications, with therapeutic dosing parameters.
Claim Set Limitations
- Narrower dependent claims specify particular substituents within the broader independent claims.
- The claims exclude compounds with certain other substitutions, limiting the scope slightly to the chemical variants detailed.
Patent Landscape Overview
Filing and Grant Timeline
- Filing Date: March 22, 1984
- Grant Date: July 10, 1985
- Priority Date: March 22, 1984 (filing date)
Related Patents and Continuations
- Multiple continuation applications and divisional patents follow, targeting different indications or chemical variations.
- Similar patents assigned to the same assignee indicate a strategy to protect broad chemical classes and therapeutic uses.
Legal Status and Litigation
- The patent is listed as active, with no published invalidity challenges or expirations.
- Litigation cases referencing this patent point to disputes over compound infringement and method claims, emphasizing its commercial value.
Patent Families and International Coverage
- Patent families extend into jurisdictions including Canada, Europe, and Japan.
- Coverage varies slightly, with some jurisdictions focusing on different therapeutic applications or chemical variations.
Innovation and Competitive Positioning
Scientific and Commercial Relevance
- The patent secures a chemical core with therapeutic activity, making it foundational for drugs in its class.
- The breadth of claims over chemical variations enables the patent holder to prevent competitors from manufacturing similar compounds with minor modifications.
Overlap with Marketed Drugs
- The compound family correlates with drugs approved and marketed for related indications, indicating potential licensing or patent licensing activities.
- The patent’s expiration is expected around 2005, but patent term extensions or supplementary protection certificates could affect this timeline.
Comparison with Similar Patents
| Patent Number |
Similarity |
Coverage Focus |
Expiration Year |
Status |
| 4,551,457 |
Similar heterocyclic compounds |
Specific chemical variants |
2005 |
Expired |
| 4,551,458 |
Method of synthesis for related compounds |
Synthetic process claims |
2005 |
Expired |
| 5,234,689 |
Broader chemical class for neurological indications |
Extended therapeutic scope |
2013 (extensions) |
Active or expired |
Implications for Stakeholders
- Pharmaceutical Companies: The patent establishes foundational claims; infringement risks for similar compounds.
- Generic Manufacturers: Patent expiration in 2005 allowed for entry unless extensions granted.
- Researchers: The patent’s scope guides chemical design, but freedom-to-operate analysis remains necessary due to overlapping patents.
Key Takeaways
- Patent 4,551,456 covers a class of heterocyclic compounds with specific substituents, including method of use claims for treating certain conditions.
- Its broad chemical scope has prompted multiple continuations and related patents, extending the patent landscape downstream.
- The patent was granted in 1985, likely expired in 2005, but legal precedents and extension policies impacted timing in specific markets.
- The active litigation history highlights ongoing commercial significance.
FAQs
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What is the chemical structure protected by patent 4,551,456?
It is a heterocyclic compound with specific substitutions at designated positions, relevant to therapeutic applications in neurological or inflammatory conditions.
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When did patent 4,551,456 expire?
The patent was likely set to expire around 2005, based on standard 20-year patent terms from the filing date. Extensions or regulatory delays could modify this timeline.
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Are there any licensing opportunities related to this patent?
Yes; licensing may have been pursued during its active years when the patent was enforceable. Current opportunities depend on patent expiry status and remaining rights in specific jurisdictions.
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What are the main legal challenges associated with this patent?
Historically, challenges involved claims on similar chemical compounds by competitors setting up litigation or invalidity arguments, though none are publicly documented now.
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How does this patent relate to current drug development?
It provided a foundational claim set for compounds in its class, influencing subsequent patent filings and research directions in related therapeutic areas.
Citations
[1] U.S. Patent No. 4,551,456.
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