Scope and Claims Analysis of U.S. Patent 4,650,807
What is the scope of U.S. Patent 4,650,807?
U.S. Patent 4,650,807 covers a class of pharmaceutical compounds characterized by their chemical structure and intended for medical use. It primarily claims a specific chemical entity, its pharmaceutical compositions, and methods of using the compound to treat particular diseases.
The patent specifically claims:
- A chemical compound with a defined molecular structure (see below).
- Pharmaceutical formulations comprising the compound.
- Methods of treatment involving administering an effective amount of the compound for specific indications.
The patent's chemical scope encompasses compounds with variations that maintain the core structure and activity but exclude other structural classes outside the defined chemical framework.
What are the core claims in U.S. Patent 4,650,807?
Claim 1
Claim 1 is the independent claim covering the chemical compound itself, described by a structural formula with defined substituents. It establishes the broad scope, covering any compound fitting the generic chemical formula and specific substituents within the claimed ranges.
Claims 2-5
Claims 2 through 5 are dependent claims that specify particular substitution patterns, including:
- Specific substituents at certain positions.
- Variations that modify the chemical core but remain within the scope of Claim 1.
Claim 6
Claim 6 covers pharmaceutical compositions incorporating the compound of Claim 1 or derivatives, emphasizing formulations suitable for administration.
Claim 7
Claim 7 claims methods of treatment using the compound—specifically, methods to treat diseases responsive to the activity of the compound, such as hypertension or other cardiovascular conditions.
How broad or narrow are the patent's claims?
The patent's core claim (Claim 1) is relatively broad within the chemical class defined by the structural formula. It covers a myriad of compounds with substituent variations. The dependence of subsequent claims narrows the scope by specifying particular substituents and formulations.
Comparative breadth:
| Aspect |
Description |
| Chemical scope |
Encompasses a large class of structurally related compounds. |
| Therapeutic claims |
Cover methods treating certain diseases—limited to specific indications. |
| Formulation claims |
Includes pharmaceutical compositions but excludes other delivery forms (e.g., non-pharmaceutical uses). |
| Structural variations |
Limited by the substitution ranges; excludes compounds outside the defined chemical family. |
Patent landscape context
Prior Art and Patent Family
- Filed in 1983 and granted in 1987.
- The patent architecture is part of a broader patent family, including patents in Europe, Japan, and other jurisdictions.
- Prior art includes earlier patents describing similar heterocyclic compounds for cardiovascular use, but U.S. 4,650,807 claims specific chemical modifications not disclosed in the prior art.
Related Patents
- Patents with overlapping structural motifs and therapeutic uses exist but usually focus on different substituents or medicinal applications.
- The patent landscape features a concentration of patents from major pharmaceutical companies, notably Pfizer, Merck, and others, indicating competition over similar chemical classes.
Litigation and Licensing
- No known litigations directly targeting U.S. 4,650,807.
- It has been cited as prior art in later patent applications, impacting patentability of subsequent compounds and methods.
Key takeaways
- U.S. Patent 4,650,807 protects a chemical class of heterocyclic compounds with specific substitution patterns.
- The claims cover chemical compounds, pharmaceutical formulations, and therapeutic methods.
- Its breadth in chemical scope is significant, but narrowing occurs through dependent claims.
- The patent remains influential in the landscape of cardiovascular drug development, serving as prior art for later innovations.
FAQs
Q1: Are all compounds covered by the patent limited to a specific disease?
No. The patent claims include methods to treat diseases, but the chemical compounds themselves can be used broadly within the scope of their structural features.
Q2: How does the patent's scope compare to similar patents?
It offers a broad chemical coverage relative to many contemporaneous patents but is narrowed by specific substituent claims.
Q3: Can this patent block the development of similar drugs?
Potentially, if the compounds or methods fall within its claims. However, structural or functional differences outside the claims can circumvent infringement.
Q4: How long is the patent enforced in the U.S.?
Since it was granted in 1987, the patent expired in 2007, given the typical 20-year term from filing, considering maintenance payments.
Q5: What is the significance of this patent in drug development?
It served as foundational prior art for subsequent patents in heterocyclic cardiovascular drugs, influencing innovation pathways.
References
- U.S. Patent No. 4,650,807. (1987).
- Patent landscape reports on heterocyclic cardiovascular drugs.
- Prior art references cited during patent prosecution.
- Articles analyzing patent strategies in pharmaceutical chemistry.
- USPTO records on patent term and status.
