Chinese Patent Search: CNIPA Tools and Search Methods

To search Chinese patents, start with a publication or application number if you have one. Otherwise, build a search from the applicant's name or the technology's keywords, then use relevant classifications to expand it. CNIPA provides separate official tools for patent searching, published documents and examination information; finding a document and checking its current legal status are different tasks.

Open CNIPA.AI's patent search to organize candidate documents, or use the official services below. CNIPA.AI is an independent third-party service, not the China National Intellectual Property Administration (CNIPA). Check coverage and source records before relying on any database's summary.

Where can I search Chinese patents?

The CNIPA official website links to these services. We checked these entry points on September 23, 2026:

• Patent Search and Analysis System — 专利检索及分析系统: official search portal, linked from the official homepage as “专利检索”. Start here when locating technical documents.
• Patent Publications — 专利公布公告: publication portal. Use the relevant document identifier to locate the published material.
• Patent Examination Information Inquiry — 专利审查信息查询: examination-information portal. Use it for the relevant procedural information rather than treating a search-result label as a complete status history.

Follow each service's current access and authentication instructions. Checking these public entry points does not establish that every function is available without an account. If an address or interface changes, return to CNIPA's official homepage to find the current service.

How to search by patent number, applicant or keywords

1. Choose the number field that matches your document

First establish whether you have an application number, a publication identifier or a grant-publication identifier. Use the corresponding search field and retain the complete identifier, including any kind code. Check the resulting title, applicant and dates against your source; similar numbers are not enough to establish that you opened the intended version.

If the service rejects the format, check its input instructions rather than removing parts of the identifier and assuming the result is equivalent. When copying a number from a PDF, check for spaces or transcription errors and compare it with the source document.

2. Expand the applicant's name

Prepare the organization's Chinese name, English name, previous names and relevant subsidiary names. Search these as separate candidates and inspect the documents before combining them into a portfolio. A familiar brand, an applicant and a current rights holder need not be the same legal entity.

3. Build a small set of technical concepts

For a synthetic example, suppose you are researching a conveyor that stops when a temperature threshold is exceeded. Candidate concepts include the object (conveyor / 输送), the measured condition (temperature / 温度) and the response (stop / 停止). These are starting terms, not verified translations for every technical context, an executed search, or evidence of patentability.

Begin with a few concepts. Read relevant original documents to discover the terminology actually used, then try synonyms and useful IPC classifications. Do not assume that a database will translate every English query, or that the same Boolean expression works across different services. Record the expression you actually entered.

4. Apply the country and other filters deliberately

In CNIPA.AI search, select China · CN in the Jurisdiction filter; on a small screen, open Filters first. Apply the filter and add an applicant, date range or IPC only when it serves your research question. Starting with too many restrictions can hide relevant documents.

Our results depend on the connected data sources and their coverage. An empty result does not establish that no relevant Chinese patent exists. Use the official publications and procedural records to verify important findings.

Read the right document version

Keep the full identifier, including the kind code. Open the document and confirm its title, applicant and technical content instead of relying on a copied number.

Follow families without transferring conclusions

Read the filing route, publication versions and relevant countries for family members. A grant in one jurisdiction does not mean another member has identical claims. The lapse of one member does not establish that the entire family is inactive.

For an implementation-risk assessment, define the product, market and date and compare relevant claims. A family summary helps navigation; it is not a clearance opinion.

Date your status check

Chinese Patent Law Article 34 concerns publication of invention applications and allows earlier publication on request. Do not apply one publication rule indiscriminately to every patent type. Article 44 addresses certain early termination events.

For consequential decisions, check the responsible office's records and relevant events. Record both the date of your search and any data-update date shown.

Keep an auditable result

Start at CNIPA.AI search or an appropriate public patent-information service. Evaluate coverage, full-text access, status freshness, language support and export conditions rather than assuming a database-size or price ranking.

Save the identifier, URL, relevant passages, jurisdiction, status events and unresolved questions. The search fundamentals guide explains how to develop the search concepts.

A short record you can copy into your own research notes:

Purpose and date: What decision is the search intended to support, and when was it performed?

Database and query: Which service, exact terms, country, classification and date filters did you use?

Document: Full identifier, title, applicant, publication date and source URL.

Relevant evidence: Claim, paragraph or figure numbers, with the feature you are comparing.

Remaining questions: Missing language coverage, document versions, interpretation or status checks.

Common questions about CNIPA patent searching

Can I search Chinese patents in English?

English titles, abstracts and translations can help you identify candidates where a database provides them. They do not establish complete English-language coverage. Follow useful identifiers to the original Chinese documents, and check technical terms, negation, numerical conditions and relationships against the original text. A translated family member is not automatically an equivalent set of claims.

Is a Chinese patent database free to use?

Access conditions differ by service and function. Check the official portal's current requirements and, for CNIPA.AI, the pricing and access conditions. Do not assume that free access to an entry page includes unrestricted full-text search, bulk downloads, exports or analysis. Coverage and reliability matter as well as price.

Is a patentability search the same as a clearance search?

No. A patentability search looks for prior disclosures relevant to the proposed invention. A clearance or freedom-to-operate assessment also requires consideration of the relevant territory, current rights and the relationship between claims and the proposed product or process. A relevant document list alone does not answer either question conclusively.

Does a “granted” label answer whether I can use the technology?

No. Current status, territory and the relationship between the claims and your product require further review.

Why can a search return no results?

Possible reasons include terminology, restrictive filters, unpublished applications, language coverage or missing data. Try alternative concepts and confirmed classifications, and record what you have not searched. A zero-result screen is not a conclusion about novelty or permission to operate.

Start a Chinese patent search on CNIPA.AI, select China in the jurisdiction filter and keep the evidence behind each candidate. If you are preparing an application, use the Chinese drafting requirements guide to distinguish searching from disclosure and claim-support work.

Turn your search notes into the next piece of work

Once you have a useful set of documents, make a feature comparison: what is disclosed in each source, and what is different in your own invention? Keep the document numbers and passages alongside your notes so you can return to the evidence.

• To explain your own components and their relationships, review the patent drawing tool and drawing preparation guide.
• To organize your own disclosure and claim-support material, open the patent drafting workspace and choose the intended filing jurisdiction before starting a draft.

The relevant source documents remain part of your research record. Generated figures and text are editable drafts; check them against your actual invention and the requirements of the intended filing route.