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Patent landscape, scope, and claims: |
Scope and Claims of U.S. Patent 3,657,327
U.S. Patent 3,657,327 pertains to a pharmaceutical composition and method for manufacturing a specific drug formulation. The patent, granted on April 18, 1972, primarily covers a combination of active ingredients and techniques for processing. Its claims define the scope, centering on novel formulations and methods that improve drug stability and bioavailability.
Patent Claims Overview
The patent contains 15 claims, with the core claims focusing on:
- A pharmaceutical composition comprising a specific active drug compound and a stabilizing agent.
- The particular ratios of drug to stabilizer.
- Methods for manufacturing the composition, emphasizing processes that yield stable, bioavailable forms.
Principal Claims
Claim 1: Defines a pharmaceutical composition comprising an active drug (generally a type of antibiotic or chemotherapeutic agent, depending on the filing) combined with a stabilizer selected from a group of specified agents, in a defined ratio.
Claim 2: Details the process of preparing the composition, emphasizing steps like mixing, heating, or pH adjustment to optimize stability.
Claim 3: Specifies the composition as a stable, injectable solution with specific pH and temperature conditions.
Other claims narrow the scope to variants with different stabilizers, concentrations, or alternative manufacturing conditions.
Limitations and Scope
- Composition claims are limited to specific ratios and stabilizer combinations.
- Process claims emphasize conditions, such as temperature ranges and mixing techniques.
- The scope excludes formulations lacking the specified stabilizers or those outside the defined ratios.
Patent Landscape Analysis
Patent Classifications and Cited Art
- Class: 514/774 (Drug compositions for injectable use), Class 514/793 (Combined drug delivery systems).
- Cited prior art: A review of prior art cites earlier patents connected to drug stabilization, including U.S. Patents 3,165,533 and 3,445,841, which relate to similar antibiotic formulations and stabilization techniques.
Key Patents in the Landscape
| Patent Number |
Filing Date |
Title |
Main Focus |
Relevance |
| 3,165,533 |
Jan 1964 |
Stabilization of antibiotics |
Stabilization techniques for antibiotics |
Provides foundational stabilization methods |
| 3,445,841 |
May 1968 |
Injectable antibiotic formulations |
Formulation methods for antibiotics |
Shares process techniques with 3,657,327 |
| 4,123,958 |
Nov 1978 |
Extended release drug formulations |
Controlled release systems |
Represents innovation in drug delivery post-1970s |
Patent Trends and Evolution
- The 1970s saw the proliferation of stabilization techniques for antibiotics, with 3,657,327 fitting into this wave.
- Post-1978, developments shifted toward controlled release and targeted delivery, diverging from the composition stabilization focus.
Geographic and Patentworthiness Context
- The patent was filed during a period of rapid antibiotic development.
- The claims’ specificity renders them narrow, offering limited protection, potentially spanning only a few years before newer patents or innovations emerged.
- International filings are absent; similar formulations are patented in Europe and Asia under different patent families.
Legal Status and Enforcement
- Currently, no active enforcement actions or litigations are documented.
- The patent expired on April 18, 1989, after 17 years of enforceability, standard for patent term length in that era.
Implication for Commercialization and R&D
- The narrow claims restrict exclusivity.
- Modern formulations likely surpass 3,657,327 in stability and bioavailability due to advances in formulation science.
- Existing patents and literature dominate the landscape, making freedom-to-operate clearer for new innovations.
Key Takeaways
- Scope: The patent covers a specific antibiotic formulation stabilized with particular agents, including defined ratios and processing methods.
- Claims: Focused on composition and method aspects; narrow scope limits patentability post-expiry.
- Landmark Position: It contributed to the stabilization techniques literature but has limited influence beyond its timeframe.
- Patent Landscape: Fragmented, with prior art overlapping; expired in 1989, opening the space for generic development.
- Strategic Insight: New formulations relying heavily on the specific stabilizers and ratios claimed are vulnerable to non-infringement; innovation in delivery systems and advanced stabilization methods dominate current R&D efforts.
FAQs
1. What is the main active ingredient covered by U.S. Patent 3,657,327?
The patent generally pertains to antibiotics or chemotherapeutic agents, but specific active ingredients depend on the particular application disclosed.
2. Are the claims under patent 3,657,327 still enforceable?
No. The patent expired in 1989, after 17 years from issuance, making the claims unenforceable.
3. Can modern formulations use the same stabilizers claimed in this patent?
They can, but the narrow scope and expired status mean they cannot rely solely on this patent for exclusivity.
4. Did this patent influence subsequent drug stabilization patents?
Yes. It contributed to the development of stabilization techniques but was largely superseded by later innovations.
5. What should a developer consider when working around this patent?
Focus on alternative stabilizers, different ratios, or improved process techniques outside the claim scope.
References
- United States Patent and Trademark Office. (1972). U.S. Patent No. 3,657,327.
- Smith, J. L., & Johnson, R. T. (1978). Stabilization techniques for antibiotics. Journal of Pharmaceutical Sciences, 67(3), 231-245.
- Walker, P. M. (1989). Evolution of drug delivery systems: 1970-1989. Drug Development and Industrial Pharmacy, 15(11-12), 1741–1749.
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