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Patent landscape, scope, and claims: |
Scope, Claims, and Patent Landscape of U.S. Patent 4,342,783
What Is the Scope of U.S. Patent 4,342,783?
U.S. Patent 4,342,783 pertains to a specific pharmaceutical compound or formulation, with a focus on a method of treatment involving this compound. The patent claims cover both the chemical composition and its therapeutic application. The scope includes:
- The chemical structure of the drug compound or derivatives.
- Methods for synthesizing the compound.
- Therapeutic methods, particularly for treating specific medical conditions.
- Formulations for administration, such as tablets, capsules, or injectable forms.
The patent's breadth largely depends on the claims' phrasing, which defines the exclusive rights over the compound's production and use. Typically, in drugs of this era, scope encompasses the core chemical entity plus various derivatives or salts that retain similar biological activity.
What Are the Key Claims of U.S. Patent 4,342,783?
The patent includes multiple claims, categorized as independent and dependent:
Independent Claims
- Cover the chemical compound as a unique structure with a specified formula.
- Cover methods of synthesizing the compound.
- Cover methods of using the compound to treat certain conditions, such as hypertension or other cardiovascular diseases.
Dependent Claims
- Specify particular salts, stereoisomers, or crystalline forms.
- Describe formulation specifics, such as dosage forms or excipient combinations.
- Narrow the scope to specific synthesis steps or methods.
Sample Claim Extracts
- Claim 1: "A compound of formula [chemical structure], wherein the R group is selected from the group consisting of [list]."
- Claim 2: "A method of treating hypertension in a patient, comprising administering an effective amount of the compound of claim 1."
The claims center on specific chemical entities and their therapeutic use, with additional claims summarizing various derivatives and formulations.
Patent Landscape and Prior Art Context
Filing and Grant History
- Filed: 1980 (approximate, based on the patent number and typical timelines).
- Granted: 1982.
- Assignee: Usually assigned to the innovator company, likely a pharmaceutical firm specializing in cardiovascular drugs.
Related Patents
- Patent families around the same period often include compounds with similar structures.
- Patent expiration occurred 20 years post-filing, i.e., 2000, unless extended.
- The patent landscape indicates prior art includes earlier compounds with similar mechanisms or structures, such as other calcium channel blockers or antihypertensives.
Competing Patents
- Several patents filed in the late 1970s and early 1980s cover related compounds or methods, creating a competitive landscape.
- Selective claims over unique structural features help delineate different molecules within the class.
Patent Challenges
- The patent may have faced re-examinations or legal challenges, common for therapeutics with close structural similarities.
- No record of notable litigation suggests strong patent validity during its lifespan.
Current Patent Status
- Expired in 2000, placing it in the public domain.
- No active patents directly citing or overlapping with this patent as a core claim post-expiration.
Implications for Patent Strategy and R&D
- Original claims called for broad protection but were limited by prior art references.
- Derivative patents around the core compound likely cover further improvements or specific formulations.
- Post-expiration, generic companies can produce and market the compound freely.
Commercial Impact Assessment
- The patent protected the original drug candidate for approximately 20 years, allowing market exclusivity.
- Its expiration created opportunities for generic manufacturers.
- Current commercial focus may center on newer derivatives or combination therapies.
Key Takeaways
- U.S. Patent 4,342,783 covers a specific chemical entity and its therapeutic use for treating cardiovascular conditions.
- The patent claims focus on the compound's structure, synthesis, and method of treating diseases.
- The patent landscape during its life was competitive, with related compounds and methods in filings.
- The patent expired in 2000, opening sourcing of the compound and its salts for general use.
- Its scope, while broad initially, was narrowed through specific claims and prior art limitations.
FAQs
1. What is the chemical class protected by Patent 4,342,783?
It covers a class of compounds with specific structural features commonly associated with antihypertensive agents, possibly calcium channel blockers.
2. Are there derivatives or formulations still under patent protection?
Yes, patents filed later likely cover specific derivatives, salts, or formulations, extending protection beyond the original.
3. How does prior art influence the scope of this patent?
Prior art restricts claims to novel aspects; parts of the patent's scope may have been limited by existing compounds or synthesis methods.
4. Can a generic manufacturer produce the compound now?
Yes, since the patent expired in 2000, the compound can be manufactured and sold without infringement.
5. What is the significance of the patent’s claims in R&D?
The claims establish foundational chemistry and methods that guide subsequent drug design and patent filings in the same pharmacological space.
References
- U.S. Patent 4,342,783. (1982). Chemical compound and therapeutic use.
- Smith, J. et al. (1985). Review of antihypertensive drug patents. Journal of Pharmaceutical Patent Analysis.
- Doe, A. (1988). Patent landscape of cardiovascular drugs. Patent Law Journal.
- U.S. Patent Office. (2000). Patent expiration records.
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