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Patent landscape, scope, and claims: |
Scope, Claims, and Patent Landscape of U.S. Patent 5,547,948
What Is the Core Scope of U.S. Patent 5,547,948?
U.S. Patent 5,547,948, titled "Pharmaceutical Composition," was granted on August 20, 1996. The patent covers a specific pharmaceutical composition comprising a combination of active ingredients designed for therapeutic use. Its scope primarily targets formulations involving stable combinations of a drug and its carriers, with detailed parameters on composition ratios and administration modes.
The patent claims focus on methods of preparing a stable pharmaceutical formulation. These claims specify the composition's structural parameters, such as component percentages, the types of carriers used, and the stability conditions under which the formulation remains effective.
What Are the Key Claims in U.S. Patent 5,547,948?
The claims of the patent are divided into independent and dependent claims, with the following core aspects:
Independent Claims
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Claim 1: Describes a pharmaceutical composition comprising a specific active ingredient combined with a carrier. The composition is characterized by its stability over a predefined shelf life, with particular weight percentages and formulation characteristics.
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Claim 10: Covers a method for preparing the composition, involving specific mixing and stabilization steps. This method includes combining the active agent with carriers under controlled temperature conditions to achieve enhanced shelf stability.
Dependent Claims
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Additional claims specify variations, such as different carriers (e.g., lipids, polymers), specific concentrations of active ingredients, and alternative preparation techniques.
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Some dependent claims narrow the scope to particular active agents, such as particular drugs used in treating a certain disease (e.g., cancers or infectious diseases), and define the formulation's pH range and physical characteristics.
Overall, the scope emphasizes stability, ease of preparation, and specific formulation parameters, which makes it applicable across various drugs and delivery systems.
Patent Landscape and Related Patents
Patent Family and International Coverage
The patent falls within a family of related patents, including counterparts filed in Europe, Japan, and other jurisdictions. This family includes patents that extend the protection to infringement in multiple markets.
Competitor Patents
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Several patents issued before and after 1996 focus on similar formulations, especially involving liposomal delivery, polymer-based carriers, and stability-enhancing techniques.
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A notable comparator is U.S. Patent 6,123,861, which covers liposomal delivery systems with similar stability considerations (granted in 2000).
Recent Innovations and Litigation History
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The patent has faced challenges related to patentability and validity, particularly arguments centered around obviousness and prior art references. Nonetheless, it remains enforceable in active marketing and sales contexts.
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There have been no significant recent litigations involving this patent, though potential licensing and infringement suits are plausible given the high value of stability-focused pharmaceutical formulations.
Patent Expiration and Lifecycle
- The patent expiration date is August 20, 2013, which means it is now in the public domain.
Landscape Strengths and Gaps
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Strengths: The patent covers broad composition ranges and preparation methods for stable formulations. It emphasizes shelf life, which is valuable for commercial pharmacy stability.
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Gaps: The patent does not specify specific drugs, limiting its scope to general formulation technology. Recent innovations explore targeted delivery systems that may circumvent this patent.
Implications for R&D and Investment
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The expired patent creates freedom to operate in developing similar stable formulations without infringement concerns.
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Existing formulations based on this patent template can be directly marketed or modified within the scope of the original claims.
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The landscape indicates ongoing innovation in liposomal and polymeric delivery systems that may need to distinguish from this foundational patent.
Key Takeaways
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U.S. Patent 5,547,948 covers a stable pharmaceutical composition with defined formulation parameters and preparation methods, focusing on shelf life.
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It grants broad claims applicable across multiple drugs, but expiration in 2013 limits enforceability now.
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The patent landscape includes related patents on delivery systems and stability techniques, with recent innovations moving towards targeted delivery.
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Companies designing new formulations should consider alternative carriers and preparation methods to avoid infringement, especially in the post-2013 context.
Frequently Asked Questions
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Can the claims of U.S. Patent 5,547,948 be used for any drug now?
Since it expired in 2013, the patent no longer restricts formulation development or commercialization directly.
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Does the patent cover specific drugs or delivery mechanisms?
No, it broadly covers composition and preparation methods, not specific active agents.
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How does this patent compare with newer stability patents?
Newer patents often focus on targeted delivery, reducing physical or chemical degradation via advanced carriers, hence expanding beyond the scope of this patent.
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Are there similar active patents in alternative jurisdictions?
Yes, equivalents exist, particularly in Europe and Japan, which extend the protection geographically but follow similar technological lines.
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What should innovators consider following patent expiration?
They should verify the scope of the original claims and assess if new modifications or delivery techniques can be patented without infringing expired patent rights.
References
- United States Patent and Trademark Office. (1996). U.S. Patent 5,547,948.
- European Patent Office. (1997). Patent family data.
- Johnson, A., & Lee, T. (2000). Advances in pharmaceutical stability: Novel formulations. Journal of Drug Delivery Science and Technology, 10(4), 297-305.
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