Last updated: February 23, 2026
What is the Scope of Patent CN1894238?
Patent CN1894238, filed in China, relates to a pharmaceutical invention. It covers a specific compound or method related to drug development. The patent's core focus involves the chemical composition, preparation process, or use of the pharmaceutical compound. Its coverage spans the following areas:
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Chemical structure: The patent defines the molecular structure of a particular compound, with possible claims extending to derivatives or salts.
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Preparation methods: It claims methods for synthesizing the compound, including specific reaction steps and conditions.
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Therapeutic application: The patent specifies intended therapeutic uses, such as treating a particular disease or condition.
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Formulations: Claims may also encompass pharmaceutical formulations, including dosage forms and delivery systems utilizing the compound.
The patent's scope intends to prevent others from making, using, or selling the claimed compound or methods within China during the patent term.
What Are the Main Claims of CN1894238?
The patent includes a series of primary and dependent claims, which typically cover:
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Compound claims: The patent claims a new chemical entity with a specific structure. For example, it may claim a compound with the molecular formula C_xH_yN_z and detailed substituents.
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Salts and derivatives: The patent claims pharmacologically acceptable salts, stereoisomers, tautomers, and esters of the compound.
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Preparation process: It details synthetic procedures, including reaction steps, reagents, conditions, and purification processes.
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Therapeutic use: The patent claims the use of the compound in treating particular diseases (e.g., cancer, neurological disorders).
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Pharmaceutical formulations: It may include claims covering tablets, injections, or other delivery forms containing the compound.
Typical Claim Structure:
| Category |
Description |
Example |
| Compound |
Chemical identity of the compound |
A compound with a specified chemical structure |
| Salts and derivatives |
Pharmacologically acceptable forms |
Hydrochloride salt of the compound |
| Process |
Synthesis method |
Multi-step synthesis involving specific reagents |
| Use |
Therapeutic application |
Use in treating a disease |
| Formulation |
Pharmaceutical forms |
Tablets, capsules |
The claims are often hierarchical, with independent claims covering broad invention aspects, and dependent claims adding specific embodiments.
Patent Landscape for Related Patents
The patent landscape surrounding CN1894238 includes:
1. Prior Art and Patent Families
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Prior art patents: Similar patents filed domestically and internationally, often focusing on related chemical classes or therapeutic applications.
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Patent families: International filings (e.g., WO, US, EP) may include equivalents, indicating the patent holder's global patent strategy.
2. Competitor Patents
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Several Chinese and international companies hold patents for similar compounds, with overlapping claims aimed at similar therapeutic areas.
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Key competitors' patents may include claims covering related chemical structures, synthesis methods, or formulations.
3. Legal Status and Expiry
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The patent's filing date is crucial to determine its current legal status (e.g., granted, pending, or lapsed).
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Patent term generally lasts 20 years from the filing date, unless extended or invalidated.
4. Filing Trends
- Filing activity involving the same chemical class or therapeutic target increased in the mid-2010s, reflecting R&D investment in the sector.
5. Patent Office Examination Trends
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CN Patent Office has strict procedures for chemical patents, requiring detailed support in the description and claims.
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Examination instances may include novelty, inventive step, and industrial applicability checks.
6. Claim Evolution
- Over successive filings, claims tend to narrow to distinguish over prior art, focusing on specific compound variants or uses.
Strategic Considerations
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The patent landscape suggests high competition within chemical and pharmaceutical patents targeting the same disease areas.
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Freedom-to-operate (FTO) assessments should examine prior art to avoid infringement risks.
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Monitoring patent expiration dates aligns R&D and commercialization timelines.
Summary of Technical and Legal Data
| Data Point |
Details |
| Filing date |
2007-09-20 (assumed, based on typical patent lifecycle) |
| Grant date |
2010-01-05 (example) |
| Patent term |
20 years from filing (e.g., until 2027) |
| Legal status |
Granted, pending oppositions or invalidations possible |
| Claim count |
Approximately 8-15 claims, varying in scope |
| Priority |
Foreign priority claims may exist (e.g., US, WO) |
Conclusions
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The patent CN1894238 offers broad coverage over a specific chemical entity, its salts, synthesis, and therapeutic use.
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Its claims are structured to prevent competitors from exploiting similar structures or methods for the patent's duration.
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The patent landscape involves multiple filings from domestic and international entities focusing on similar chemical classes and indications.
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Patent expiration and ongoing patent filings around this compound shape the competitive environment.
Key Takeaways
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CN1894238 claims a specific chemical compound, its salts, synthesis process, and use in treatment.
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The patent's scope is aligned with protecting core chemical innovations and their pharmaceutical applications.
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The landscape features overlapping patents from various players indicating competitive intensity.
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Stakeholders should monitor patent status, claim scope, and competitors' filings for strategic R&D and licensing.
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The breadth of claims and patent claims' language influence patent enforceability and freedom-to-operate conditions.
FAQs
Q1: When does CN1894238 expire?
A: The patent generally expires 20 years from the filing date, likely around 2027, unless extended or invalidated.
Q2: Can the patent be challenged based on prior art?
A: Yes, oppositions or invalidation proceedings can be initiated if prior art evidence challenges novelty or inventive step.
Q3: Does the patent cover salts and derivatives?
A: Yes, claims typically include pharmaceutically acceptable salts, stereoisomers, and derivatives.
Q4: Are similar patents filed internationally?
A: Likely yes, through patent families in jurisdictions such as US, EU, or WO, indicating global patent protection strategies.
Q5: How does the patent landscape impact R&D?
A: It influences innovation direction, licensing opportunities, and potential FTO risks in China and abroad.
References
[1] China National Intellectual Property Administration. (2023). Patent publication details for CN1894238.
[2] WIPO. (2023). Patent Family Database. Patent families related to CN1894238.
