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Common Citation Document (CCD)


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Espacenet patent search

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Espacenet offers free access to information about inventions and technical developments from the 19th century right up to today.

    National patent offices' databases

Accessible to beginners and experts, Espacenet contains data on more than 90 million patent documents from around the world. Supporting information can help you understand whether a patent has been granted and if it is still in force.


You can use Espacenet to:

  • search and find patent publications
  • machine-translate patent documents
  • track the progress of emerging technologies
  • find solutions to technical problems
  • see what your competitors are developing
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Espacenet is available free of charge, 24 hours a day, 7 days a week.

It is not intended for bulk data retrieval and users are limited to ten search-related actions per minute. The service does not support automated searches (robots) and will deny access to any robots it identifies.

For more details please read our fair use charter.

The terms and conditions of use for the website apply. 

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Special Features 

When you use Espacenet, you also have access to a number of helpful tools and resources.

Global Dossier

Applicants often file patent applications for the same invention at multiple patent offices. Global Dossier brings these documents together in one place, to give you access to the correspondence (or “file wrapper”) between applicants/attorneys and the offices concerned for Canadian, Chinese, European, Japanese, Korean, US and PCT applications. It also offers you automatic machine translations of Chinese, Japanese and Korean documents into English.

Global Dossier is available from the European Patent Register and Espacenet.

Common Citation Document

The Common Citation Document (CCD) tool provides a single point of access to citation data for the patent applications of the largest five IP offices (IP5).

This tool consolidates the prior art cited by all participating offices for the family members of a patent application, showing the search results from different offices on a single page.

Classification search

Classification search is a powerful tool for you if you need to retrieve patent publications in a particular technical area. Classification search in Espacenet helps you to find suitable classification symbols for your search, and then to apply in the search itself.

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