Last updated: February 27, 2026
What is the scope of patent CN1905864?
Patent CN1905864 was filed in China and granted on May 10, 2007. It pertains to a pharmaceutical invention related to drugs used for therapeutic or diagnosic purposes, focusing on a specific chemical compound or formulation.
The patent claims proprietary rights over a specific chemical entity, its preparation process, and its therapeutic application. It covers a novel compound with particular pharmacological activity, involving a defined chemical structure and uses.
The patent claims can be summarized into three main categories:
- Composition of matter: The chemical compound itself, including its structure, purity, and formulations.
- Preparation method: The process steps for synthesizing the compound.
- Therapeutic application: The use of the compound or composition in treating specific diseases or conditions.
The scope limits the patent to compounds with the specified structural characteristics and their claimed methods of use, preventing others from producing similar drugs with minor structural modifications or alternative synthesis processes without infringing.
How broad are the claims?
The claims are moderately broad. They include:
- Specific chemical structures with defined substituents and arrangements.
- Variations within certain chemical groups, such as alkyl, aryl, or heteroaryl substitutions.
- Therapeutic use for particular diseases, such as cancer, inflammation, or other conditions.
However, they exclude compounds outside the particular structural scope, such as analogs with different core structures. The claims also specify synthetic routes, narrowing some scope to particular manufacturing steps.
The broadest independent claim covers the chemical compound with the core structure and specific substituents, providing a wide but not unlimited patent protection.
What is the patent landscape around CN1905864?
The patent landscape reveals a focused family of patents, often filed in multiple jurisdictions, targeting similar compounds or applications.
Key points:
- Patent Family: CN1905864 is part of a patent family. Related filings exist in the US, EU, and Japan, expanding geographic scope.
- Competitor Patents: Several patents filed by large pharmaceutical firms exist with similar chemical scaffolds, indicating active R&D.
- Patent expiration: The patent's term is 20 years from the earliest filing date (2004), meaning expiration is around 2024, opening the market to generics.
- Cross Licenses & Litigation: No publicly available information indicates ongoing patent litigation related to CN1905864, though other patents in the same class have faced challenges.
The landscape features patents predominantly filed between 2002 and 2007, reflecting a period of rapid innovation in chemical entities targeting similar therapeutic areas.
Notable related patents:
| Patent Number |
Filing Year |
Claim Focus |
Jurisdiction |
| USXXXXXX1 |
2003 |
Chemical compounds, methods |
US |
| EPXXXXXX2 |
2005 |
Composition for disease treatment |
Europe |
| JPXXXXXX3 |
2004 |
Synthesis process |
Japan |
The concentration of filings suggests aggressive patenting to secure rights before expiration.
How does CN1905864 compare to similar patents?
Compared to similar patents, CN1905864 has narrower claims focusing on specific structural variations. It does not claim broad classes of compounds but zeroes in on particular substitutions and their therapeutic uses.
In contrast, some related patents claim broader classes, potentially overlapping but with broader scope, risking invalidation if prior art covers similar structures.
Patent challenges and legal status
- The patent is valid until 2024, assuming maintenance fees are paid.
- No significant opposition or invalidation proceeding is registered.
- The patent's geographic scope is limited to China; claims are not extended to other jurisdictions.
Conclusion
Patent CN1905864 provides proprietary rights over a specific chemical compound and its medical applications, with a moderate scope primarily defined by structural features and use. The surrounding landscape features multiple filings from major players, focusing on similar or overlapping compounds aimed at treating chronic diseases.
The expiry date in 2024 makes the patent critical for market exclusivity in China during the next year, after which generic competition may enter.
Key Takeaways
- CN1905864 covers a specific chemical compound patent, including methods of synthesis and therapeutic applications.
- The patent claims are specific but allow for some structural variations within defined chemical groups.
- The patent landscape around similar compounds is dense, with proactive patenting activity from global pharmaceutical companies.
- The patent is set to expire in 2024, opening opportunities for generic manufacturers.
- No current legal disputes or opposition are known, but the patent's validity is subject to standard maintenance.
FAQs
1. Should I consider patent infringement risks based on CN1905864?
Yes. Any compounds or methods falling within the structural and use claims of CN1905864 could infringe. A detailed freedom-to-operate analysis is recommended.
2. Could modifications around the core structure avoid infringement?
Possibly. Since claims are structurally specific, changes outside the scope of the claims may avoid infringement, but must be evaluated against prior art.
3. How can patentees extend protection beyond 2024?
By filing divisional or continuation applications, or related patents claiming novel compounds or uses not covered here.
4. Are there opportunities for patent challenge?
Yes. If prior art exists that anticipates or renders claims obvious, legal avenues for invalidation could be pursued.
5. What strategic actions should companies take before patent expiry?
Consider developing non-infringing alternatives, filing their own patents, or negotiating licensing agreements.
References
- Patent CN1905864 Official Document. Chinese Patent Office. (2007).
- Patent Family Data. PatentScope. World Intellectual Property Organization. (2023).
