How to Read Chinese Patent Records When Evaluating a Machinery Supplier

Decoding the number

A Chinese patent document is identified by the country code CN, a serial number and a kind code. CNIPA's standard for these codes, published as SIPO Order No. 34 in 2004 and available on WIPO Lex, assigns the letters as follows:

Digits after the letter mark reprints (for example A8, B9). The 2004 standard was replaced in 2012 by a revised version (ZC 0008-2012). Older records also do not always follow the table: on Google Patents, at least some utility models granted before 2010 carry a Y suffix rather than U. Read a code in light of when the document was published.

The application number is a separate identifier. In the examples in CNIPA's bibliographic data standard, the digit after the filing year shows the type: 1 for inventions, 2 for utility models, 3 for designs (for example 2004 2 0000001.9 for a utility model).

The commonest misreading is treating an A number as a patent. It is only a published application; check whether a B document followed.

The dates that matter

• Filing (application) date. Under Article 42 of China's Patent Law (as amended in 2020), protection runs from this date: 20 years for inventions, 10 for utility models, 15 for designs. Filing date plus term gives the latest possible expiry.
• Publication date of the A document. Article 34 provides for invention applications to be published after 18 months from filing, or earlier on request.
• Grant announcement date. Under Articles 39 and 40 the right takes effect when the grant is announced. This is the date on the B, U or S document.

A design filed long ago may be near or past the end of its term, even if still advertised.

Invention patent or utility model: why the difference matters

The two rights go through different examination. An invention application is granted only after substantive examination, which the applicant must request within three years of filing (Articles 35 and 39). Utility models and designs are granted after preliminary examination only (Article 40).

For a buyer, this means a U record shows that an application met the preliminary requirements. No examiner has tested it for novelty and inventiveness against earlier technology. A utility model can still be valid, but it is a weaker sign of originality than a granted invention. Suppliers sometimes call utility models "patents"; the kind code tells you which is which.

Checking whether the right is still alive

A granted patent can end early. Article 43 requires annual fees from the year of grant, and Article 44 ends the right early if fees go unpaid or the owner gives it up in writing. A transfer of a patent takes effect only when registered with CNIPA (Article 10), so the applicant on the printed document may no longer be the owner.

Three free tools, each with different strengths:

• CNIPA Patent Search and Analysis System (pss-system.cponline.cnipa.gov.cn). Free and run by the patent office. CNIPA's 2024 report to WIPO says the system now shows real-time legal status for Chinese patents in WIPO's ST.27 format. CNIPA also runs an examination information inquiry service (cpquery.cponline.cnipa.gov.cn) covering fees, examination, invalidation and register data. This is the closest to an official answer; allow time for registration and setup.
• Google Patents. Fast, machine-translated, and shows original and current assignee plus an event timeline (for example "ceased for non-payment of annual fee"). Each page carries Google's own caveat: "The legal status is an assumption and is not a legal conclusion."
• Espacenet (European Patent Office). Shows the patent family and a Legal events tab built from national office data; the EPO advises confirming status with the national office or register.

If tools disagree, rely on CNIPA and note the date.

What a patent record tells you, and what to ask next

A valid record proves that a named applicant filed a described technical solution on a given date and, for B, U and S documents, that a right was granted. Ask separately whether:

• that the machine being quoted to you uses the patented design;
• that the claims cover anything meaningful to your purchase (read the claims, not just the title);
• that the supplier still owns or controls the right;
• that the machine performs well or is free of other parties' patents.

Performance is shown by a trial with your own material and a factory acceptance test, and protected by warranty terms, not a patent list.

Matching a patent to the machine on offer

Linking a record to the exact equipment quoted is rarely one-to-one. (The listings below say nothing about patents; they show how product scope is described.)

Families and series. Many listings describe a range rather than one machine. The hot-air stenter family entry is a configurable family with separate sheets for overfeed and edge handling, oven air path and burners. The CT embroidery series covers cap, garment and flat configurations, not one machine with every attachment. A subsystem patent may apply to some configurations only, so ask which one contains it, then compare configurations on that basis. The stenter and heat-setting guide explains those subsystems, and the dyeing and finishing section lists more examples.

Components and retrofits. A record may cover a device rather than a whole machine. The top-drive four-roller compact spinning listing is a conversion system for an existing ring frame, so a related record would describe the add-on, not the frame (see spinning machinery for the frames themselves). On a loom, the SHRP weft feeder is a separate component for rapier weaving, and the SXACT-GT2003-II is listed as a pattern operating unit for electronic dobbies. If a loom supplier cites a patent, ask whether it belongs to the loom maker or a component supplier; the loom types guide shows how many subsystems a loom combines. Browse weaving machinery and parts and accessories to see how separately these items are sold.

Identity versus specification. The JL628A listing shows a clear model identity without a reliable model-specific parameter schedule. Patent records are similar: they confirm who filed what, while your machine's specification must still come from the supplier in writing.

A short verification routine

1. Ask the supplier for full numbers, kind codes included, and which model and configuration embodies each one.
2. Look each number up on the CNIPA system and on Google Patents.
3. Compare the applicant or current patentee with the Chinese legal name on the supplier's business licence. A mismatch may reflect a parent company or assignment; ask, and check the assignment was registered.
4. Record the kind code, filing date, grant date and current status, and file them with the rest of your manufacturer profile notes.
5. Read the first independent claim and ask the supplier's engineer to show where it appears on the machine.

Sources

1. Patent Law of the People's Republic of China (as amended 17 October 2020), Chapters II–V. National People's Congress (English text published on the NPC site hosted by China Daily). and (accessed 2026-11-04) View source
2. Standard on Patent Document Kind Codes (SIPO Order No. 34, ZC 0008-2004), WIPO Lex record CN227, including note of its replacement by ZC 0008-2012. World Intellectual Property Organization. (accessed 2026-11-04) View source
3. Standard for Bibliographic Data Items of Patent Documents (application and publication number examples). China National Intellectual Property Administration. (accessed 2026-11-04) View source
4. Annual Technical Report on Patent Information Activities in 2024 submitted by CNIPA. WIPO Committee on WIPO Standards. (accessed 2026-11-04) View source
5. How can I find out if a particular patent or patent application is still valid? European Patent Office. (accessed 2026-11-04) View source
6. Google Patents record pages (legal status disclaimer and event timeline, checked on a 2008-filed Chinese utility model record). Google. (accessed 2026-11-04) View source