China Patent Inquiry System (SIPO)

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The China Patent Inquiry System is a Chinese patent registration and file history search system created by the State Intellectual Property Office (SIPO) of China. The site only appears to be available in Chinese, so users will need to utilize a machine translation service like Google Translate to translate the interface into their language of choice. The site has two available log-in options:

  • E-Filing Registered User Inquiry - Users need a log-in and password to access this version of the site. This appears to be the version of the system used for for filing patent application documents.
  • Public Inquiry - This site is available for public use, but the user must first agree to the terms of a declarative legal statement before entering the site.

After agreeing to the legal statement on the public version of the site, users can search by:

  • Application No./Patent No.
  • Invention title
  • Applicant
  • "Start filing date" (approximate translation from Google Translate)
  • "As of the date of filing" (approximate translation from Google Translate)

According to the EPO website, the China Patent Inquiry System was first introduced in April 2012:[1]

The system covers Chinese patent, utility model and design applications filed on or after 10 February 2010, and is updated weekly.

You can retrieve bibliographic data, application information, corrections, SIPO actions, decisions and other documents on file. Post-grant information is not included, however. The documents are provided in PDF.

An EPO guide to searching the China Patent Inquiry System can be found here (PDF).


  1. "FAQ - China." EPO website, Accessed August 23, 2012.

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