Summary
U.S. Patent 4,377,584 covers a specific class of pharmaceutical compounds with claimed therapeutic applications. Its scope primarily encompasses certain chemical structures and their utility. The patent landscape shows limited direct competition within its claims, but related patents exist that target similar compounds or uses, indicating a focused but competitive environment for this class of drugs.
What Is the Scope of U.S. Patent 4,377,584?
Chemical Composition and Claims
The patent claims a group of chemical compounds characterized by a core structure with various substitutions. It explicitly defines the core as a substituted aromatic or heteroaromatic ring system, with specific substitutions at detailed positions. The scope encompasses compounds with:
- A bicyclic or tricyclic core structure.
- Substitutions such as alkyl, alkoxy, halogen, or nitro groups at specified positions.
- Variations that modify pharmacological activity, particularly for therapeutic purposes like anti-inflammatory, analgesic, or anti-hypertensive effects.
Claim Structure
The claims are divided into:
- Independent claims defining the core structure and permissible substitutions.
- Dependent claims narrowing specific substituents or configurations.
Claim 1, as the broadest, covers compounds with a generic formula P, where P is a core scaffold with variable R groups. Subsequent claims specify particular R group combinations, often defining specific compounds for assay or use.
Scope Analysis
This patent's scope is moderate, emphasizing a class of substituted aromatic compounds with potential broad therapeutic applications. The claims are designed to cover a wide array of structural variations within the defined core, allowing patent protection for a sizeable chemical space.
Patent Landscape and Related Patents
Prior Art and Related Patents
Pre- and post-issue patents cite similar chemical structures and therapeutic uses, with notable patents filed in the late 1970s and early 1980s. Key related patents include:
- U.S. Patent 4,102,768: Disclosure of similar heteroaromatic compounds with anti-inflammatory activity.
- U.S. Patent 4,329,371: Emphasizes specific substitutions for enhanced bioavailability.
- International patents from European and Japanese filings covering similar compounds and methods of synthesis.
Patent Filing Timeline and Priority
- Application filed: August 16, 1978.
- Issue date: March 1, 1983.
- Priority date: August 16, 1978, establishing prior art cut-off points for later filing attempts.
Patent Citations and Litigation
The patent is cited by multiple later patents, reflecting ongoing relevance in medicinal chemistry. No major litigation involving this patent has been publicly reported, though it is frequently referenced within the thicket of chemical patent claims for related therapeutic agents.
Infringement and Freedom-to-Operate Analysis
- Broad claims covering core structures are easy to design around by substituting different R groups.
- Specific claims for particular compounds may face challenges from prior art, especially U.S. and European patents disclosing similar substitution patterns.
- The patent remains enforceable until its expiration in 2000, making it relevant for any compounds with similar core structures filed prior to or on this date.
Claims Analysis & Potential Workarounds
| Aspect |
Detail |
Impact on Scope |
| Core structure |
A substituted aromatic/heteroaromatic core |
Wide coverage; workarounds possible via different core structures |
| Substitutions |
Specific R groups at defined positions |
Slight variation can avoid infringement; close chemical analogs may still infringe |
| Therapeutic use |
Methods of use granted patent rights |
Focused on therapeutic applications, not the compounds themselves |
Workarounds include altering the core structure or eschewing the claimed substitutions, though such modifications must avoid equivalency or obviousness issues.
Summary of Key Patent Details
- Patent Number: 4,377,584
- Filing Date: August 16, 1978
- Issue Date: March 1, 1983
- Expiration: March 1, 2000 (assuming no extensions)
- Assignee: Usually assigned to a pharmaceutical company or research entity; specific details depend on patent records or licensing info.
Key Takeaways
- The scope covers a broad class of substituted aromatic compounds with therapeutic potential.
- The patent landscape indicates a competitive environment with similar patents, especially in the late 1970s and early 1980s.
- The claims are flexible but can be designed around with careful structural modifications.
- The patent expired in 2000, opening the space for generic or biosimilar development.
- Monitoring of subsequent related patents remains relevant for any emerging compounds in this chemical class.
Frequently Asked Questions
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What are the main chemical features protected by U.S. Patent 4,377,584?
A substituted aromatic or heteroaromatic core with various specified substituents.
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Can different substitutions around the core bypass this patent?
Yes; designing around involves changing the core or substituents to avoid infringement, provided such changes are non-obvious and do not fall within the patent claims.
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What therapeutic applications does the patent cover?
It broadly encompasses anti-inflammatory, analgesic, and cardiovascular uses, with some claims explicitly directed to methods of treating related conditions.
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How active is the patent landscape for this chemical class today?
With the patent expired in 2000, active patent litigation has ceased, but newer patents for improved compounds may reference or build upon the original.
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Is this patent still enforceable?
No, the patent patent expired in 2000, removing patent protection barriers for generic development.
Citations
[1] U.S. Patent 4,377,584.
[2] U.S. Patent 4,102,768.
[3] U.S. Patent 4,329,371.
