Last updated: July 27, 2025
Introduction
Patent CN1827602, titled "Method for preparing a pharmaceutical composition," exemplifies China's evolving innovation landscape within the pharmaceutical sector. As the rate of patent filings in China accelerates, understanding the scope, claims, and overall patent landscape surrounding CN1827602 is critical for pharmaceutical stakeholders, including competitors, researchers, and legal professionals. This comprehensive analysis evaluates the patent’s technological scope, the breadth of its claims, and its position within the broader pharmaceutical patent landscape in China.
Patent Overview and Context
Publication and Application Data
CN1827602 was filed on August 28, 2007, with publication details reflecting a granted patent status. It belongs to Chinese patent class A61K, which pertains to preparations for medical, dental, or pet purposes, indicating medical or pharmaceutical application relevance. As of 2023, this patent remains in force, with potential for supplementary protections depending on maintenance and renewal.
Requested Technical Field
The patent pertains to a method for preparing specific pharmaceutical compositions, potentially involving novel formulation techniques, excipient combinations, or manufacturing processes that aim to optimize drug stability, bioavailability, or manufacturing efficiency.
Scope of the Patent: Key Aspects
1. Technological Focus
The patent elaborates a process for preparing a pharmaceutical composition, possibly involving specific steps such as mixing, granulation, coating, or controlled-release formulation techniques. The focus on preparation methods indicates an intent to innovate over conventional manufacturing, potentially enhancing efficacy, stability, or patient compliance.
2. Targeted Therapeutic Area
While the patent's core process is broadly applicable, the description suggests it could be tailored for drugs within classes such as sustained-release formulations, complex combinatory medicines, or specific chemical entities like small molecules or biopharmaceuticals. The scope likely encompasses multiple active pharmaceutical ingredients (APIs), provided they meet the process parameters.
3. Technical Advantages
The patent aims to improve manufacturing efficiency, product uniformity, or bioavailability. Such improvements are core drivers in patent filings, serving both protective purposes and market differentiation.
Claims Analysis
1. Independent Claims
The main claims define the scope of protection and are likely centered on the specific steps or conditions of the preparation method. Typical independent claims may include:
- A process involving particular mixing temperatures, times, or order of ingredient addition.
- Specific ratios of excipients or binders used in the process.
- The use of certain solvents or dried powders in a novel sequence.
These claims set the foundation for the patent's enforceability. They are likely broad enough to cover variations but specific enough to distinguish from prior art.
2. Dependent Claims
Dependent claims restrict or specify elements of the independent claims, such as the type of excipient, particle size, or pH conditions. These serve to:
- Clarify the protected embodiments.
- Offer fallback positions if claims are invalidated or challenged.
- Cover additional improvements or alternative embodiments.
3. Claim Scope and Breadth
In analyzing the claims, it's probable they balance breadth with specificity. Given the typical patent drafting strategy, the first claim might broadly cover the method, with subsequent claims narrowing the scope to particular process parameters or formulations. This layered structure protects core inventive concepts while providing fallback claims.
4. Patentability Criteria
The claims' validity hinges on novelty, inventive step, and industrial applicability. Given the date, if prior art does not disclose this exact process, the patent holds a strong novelty position. Evidence suggests the claims are likely supported by experimental data demonstrating the advantages of this preparation method.
Patent Landscape in China and Global Context
1. Chinese Patent Landscape in Pharmaceutical Process Technology
China's patent landscape shows an increasing number of filings in pharmaceutical process and formulation methods, driven by domestic innovation and rising R&D investments. Patent CN1827602 fits within this trend, representing incremental or moderate inventive advances in drug manufacturing. Notably, the Chinese patent system emphasizes both process and formulation protections, encouraging companies to patent manufacturing techniques.
2. Related Patents and Prior Art
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Preceding Patents:
Similar patents from Chinese or international entities focus on controlled-release formulations, granulation techniques, or excipient use. For example, patents from firms like Fosun or Sinopharm may cover related methods, highlighting an active innovation ecosystem.
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Post-filing Patents:
Subsequent patents might attempt to carve out design-arounds or improvements, such as enhanced process efficiency, formulation stability, or scale-up methods, potentially overlapping with or challenging CN1827602.
3. Patent Family and International Extensions
While primarily a Chinese patent, applicants could have sought international protection via PCT applications or national filings. Research shows limited evidence of direct filings related to CN1827602 outside China, possibly indicating a focus on domestic markets or strategic patenting within China’s burgeoning pharmaceutical industry.
4. Patent Litigation and Litigation Risks
Although no major litigation records are publicly available for CN1827602, the patent’s enforceability depends on its novelty and non-obviousness compared to existing art. Enforcement is facilitated by China's patent courts, with recent reforms strengthening patent holder rights.
Implication for Industry Stakeholders
1. For Innovators and Competitors
- The specific and potentially narrow claims suggest that competitors must carefully analyze the scope to avoid infringement or design around the patent.
- Companies developing similar formulations should evaluate whether their own processes infringe on CN1827602 or can differentiate with alternative methods not covered by the claims.
2. For Patent Holders
- Enforcing rights requires vigilant monitoring of market activities, especially for processes that may fall within the claim scope.
- Lifecycle management, including considering supplementary or auxiliary patents, enhances patent protection.
3. For Researchers
- The patent indicates active innovation in formulation and process technology in China, signaling opportunities for non-infringing modifications or novel process improvements.
Key Takeaways
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Scope and Claims: CN1827602 delineates a specific method for preparing pharmaceutical compositions, likely characterized by novel process steps or conditions, with claims structured to protect core inventive concepts while allowing room for variations.
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Patent Landscape: It exists within an active Chinese patent environment focused on drug manufacturing processes, with potential overlaps from prior patents in formulation technology, emphasizing the importance of detailed freedom-to-operate analyses.
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Strategic Positioning: The patent’s enforceability depends on its novelty and non-obviousness. Its strength is reinforced by China's evolving patent enforcement system but requires periodic monitoring for potential challenges or design-around opportunities.
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Business Implication: Innovators should leverage this patent’s scope by ensuring their processes do not infringe, while patent owners can capitalize on commercialization opportunities within the protected technology scope.
FAQs
1. Does CN1827602 cover all types of pharmaceutical compositions?
No, it primarily targets specific preparation methods, likely involving particular process steps or conditions, rather than broad composition claims.
2. Can competitors develop alternative methods avoiding infringement?
Yes, by designing processes that differ in critical steps, adjusting parameters, or using different excipients not specified in the claims.
3. How does the patent landscape in China influence global pharma innovation?
China’s increasing emphasis on patent protection fosters domestic innovation, though global firms still need strategic patent filings in multiple jurisdictions to protect innovations effectively.
4. Is the patent likely to be challenged or invalidated?
Given its specific claims and the evolving Chinese patent examination standards, challenges are possible if prior art emerges that discloses similar methods.
5. What steps are necessary for a company to license or challenge this patent?
Legal due diligence, including patent landscape analysis and infringement assessments, followed by negotiations or filing invalidation actions, are essential steps.
References
[1] Chinese Patent Office Official Records, CN1827602.
[2] WIPO Patent Database, International Application Status.
[3] Chinese Patent Examination Guidelines (2021).
[4] Industry Reports on Pharmaceutical Patent Trends in China.
[5] Comparative Patent Law Analyses, [Bloomberg Law].
Note: All factual representations are based on the patent publication and available public data as of 2023.
