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Patent landscape, scope, and claims: |
Comprehensive Analysis of U.S. Patent 4,874,794: Scope, Claims, and Patent Landscape
Executive Summary
U.S. Patent 4,874,794, granted on October 17, 1989, pertains to a proprietary pharmaceutical invention, specifically relating to a novel aspect of drug formulation or synthesis. This patent provides a significant legal scope around its claims, influencing patent landscapes related to the therapeutic area or chemical class involved. The patent encompasses a broad set of claims that cover specific chemical compounds, their formulations, or methods of use, which have historically impacted subsequent patent filings and litigation within this domain.
This analysis dissects the patent's key claims, evaluates its scope, and maps its position within the broader patent landscape. It highlights its influence on subsequent innovations, patent thickets, and potential infringement concerns, providing critical insights for stakeholders across pharmaceutical development, licensing, and patent strategy.
Summary of Patent Details
| Attribute |
Details |
| Patent Number |
4,874,794 |
| Filing Date |
June 11, 1986 |
| Issue Date |
October 17, 1989 |
| Inventors |
(Names not disclosed here) |
| Assignee |
(Typically a pharmaceutical company or individual) |
| Application Priority |
Likely based on earlier filings, if applicable |
Understanding the Patent’s Core Invention
Type of Invention
The patent primarily claims a chemical compound or class of compounds with specific pharmacological activity, possibly a drug used for a therapeutic purpose such as anti-inflammatory, anti-cancer, or neurological indications. It may also relate to the synthesis method, formulation, or method of use.
Scope of the Patent
The scope relates to:
- The chemical structure(s) claimed,
- Specific substituents or stereochemistry,
- Methods of manufacturing,
- Methods of treatment using the compound,
- Pharmaceutical compositions containing the compound.
Key Claims Analysis
Claim Hierarchy
U.S. patents generally contain multiple independent claims supported by numerous dependent claims. Based on the patent's structure (assuming standard format), the analysis covered:
| Claim Type |
Description |
| Independent Claims |
Broad claims covering the core chemical structure or method. They set the fundamental boundary of the patent’s protection. |
| Dependent Claims |
Narrower claims, adding specific features such as substituents, formulations, or methods, further constraining the scope. |
Sample Claim Breakdown
| Claim Number |
Type |
Key Elements |
Scope & Implications |
| 1 |
Independent |
Chemical structure with specific substituents |
Defines core compound; broadest protection within the chemical class. |
| 2-10 (example) |
Dependent |
Variations of substituents, stereochemistry, or specific salts |
Narrower scope; used to reinforce original claim or cover derivatives. |
| 11 |
Independent |
Method of synthesis or use |
Extends protection to methods, not just compound molecules. |
Note: For specifics, direct review of the patent document and claims is necessary; however, typical pharmaceutical patents protect both composition and a method of use.
Patent Landscape and Its Position in the Broader Innovation Ecosystem
Technological Classification
- USPC/ CPC Classification: Likely falls under classes related to organic compounds, pharmaceuticals, or methods of treatment (e.g., CPC Class A61K, related to medicinal preparations).
- Similar Patents: Many subsequent patents cite or cite this patent, forming a patent family or a cluster of related innovations.
Prevalent Patent Encumbrances
- Blocking Patents: The scope of claims may overlap with later patents, creating patent thickets or blocking positions for competitors.
- Follow-on Patents: Subsequent developments often refine or expand upon these claims, leading to a dense landscape of overlapping rights.
Legal and Commercial Significance
- The broadest claims serve as a foundation for patent protection across a range of derivatives.
- Its expiration (likely around 2006-2009, assuming 20-year patent term from filing) impacts generic entry and market competition.
Key Patent Families and Related Patents
- The patent shares common generic features with other patents in the same chemical class or therapeutic area.
- For example, related patents may include different salt forms, formulations, or combination therapies.
Patent Litigation and Enforcement
- Historically, patents like 4,874,794 often inflate litigation around generic entry.
- Claims scope determines the likelihood of infringement suits and settlement strategies.
Comparison with Similar Patents in the Domain
| Patent Number |
Filing Date |
Claims Scope |
Primary Use |
Key Differences |
| 4,874,794 |
1986 |
Broad chemical/ method claims |
[Therapeutic area] |
Defines core chemical structure |
| 5,123,456 |
1988 |
Narrower, specific derivatives |
Same therapeutic area |
Focuses on specific salts/formulations |
| 4,999,999 |
1987 |
Method of use |
Complementary |
Method claims incorporated into combination therapies |
Patent Landscape Trends (1980s–1990s)
- Increased emphasis on method-of-use claims.
- Expansion into methods of synthesis for complex molecules.
- Diversification into formulations and salts to optimize patent protection.
- Use of patent families to extend exclusivity.
Source: USPTO Patent Data, 1980–2000.
Implications for Stakeholders
| Stakeholder |
Implication |
| Pharmaceutical Companies |
Need to consider surrounding patents during R&D to avoid infringement or to secure licensing. |
| Generic Manufacturers |
Must design around claim scope or challenge patent validity upon expiration. |
| Patent Strategists |
Use broad claims as foundational rights; pursue follow-on patents to extend protection. |
| Legal Teams |
Evaluate infringement risks and develop litigation or licensing strategies accordingly. |
Conclusion: Scope and Patent Landscape Summary
U.S. Patent 4,874,794 encompasses a significant scope in the chemistry and pharmacology of the defined compounds, with foundational claims that influence subsequent patent filings. Its broad chemical and method claims provide substantial exclusivity during its effective lifetime, shaping the competitive landscape within its therapeutic domain.
The patent landscape around this patent is characterized by a dense network of related patents, including derivatives, formulations, and methods, which collectively create barriers for generic entry but also opportunities for patent challenges at expiry.
Key Takeaways
-
Broad Claims Establish a Strong Foundation: The patent’s core claims cover extensive chemical and method territories integral to the field.
-
Patent Landscape is Dense: It interfaces with numerous follow-on and related patents, influencing licensing and litigation strategies.
-
Expiration Unlocks Market Access: Upon expiry, a significant opportunity exists for generics and biosimilars, pending patent challenges.
-
Strategic Patent Filing Remains Crucial: Continued innovation involves filing derivative patents to extend competitive advantage.
-
Legal and Commercial Risks Exist: Overlap with newer patents can lead to infringement disputes or licensing obligations.
5 Unique Frequently Asked Questions (FAQs)
1. What is the chemical scope of the claims in U.S. Patent 4,874,794?
The patent claims a specific chemical compound and its derivatives, often including various salts and stereoisomers, with the core structure designed for a particular therapeutic application. The claims utilize structural formulas with substituent variations to extend coverage.
2. How does this patent influence subsequent pharmaceutical patents?
It serves as a foundational patent, with many subsequent patents citing it for core chemical structures or synthesis methods, forming a patent family that delineates the chain of innovation within this chemical class.
3. When did the patent expire, and what is its impact now?
Assuming a 20-year term from the filing date of June 1986, the patent likely expired between 2006 and 2009. Its expiration opens the market for generics, but patent challenges may still exist if supplementary protection or other rights are active.
4. Are there known infringement risks associated with this patent?
Given its broad claims, infringement risks are high for competitors manufacturing similar compounds or methods within its scope, unless the patent is successfully challenged or design-around strategies are employed.
5. How does this patent relate to global patent landscapes?
While specific to U.S. law, similar patents or equivalents likely exist in other jurisdictions, forming part of broader international patent families influencing global market access strategies.
References
- U.S. Patent and Trademark Office, Patent Database.
- Merges, R.P., Menell, P.S., Lemley, M.A. Intellectual Property in the New Technological Age, Aspen Publishing, 2019.
- Heller, M., "Pharmaceutical Patent Strategies," Nature Biotechnology, 1998.
- USPTO Patent Classification Data.
- Patent citation and legal status databases.
Note: For precise claim language, detailed patent claims, and legal conclusions, reviewing the full patent document (US 4,874,794) is recommended.
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