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Concordance between the U.S. patent classification system (USPC) and the international patent classification (IPC) [Database] - 7th ed.
patents - intellectual property rights - classification systems

Also available: the U.S.-to-Locarno concordance.

European patent classification [Database]
European Patent Office \ [ca. 2002]
patents - europe - classification systems

Browsing is by class or code only, not by keywords. In the European Patent Office, the technical content of patent documents is classified according to the European Classification, which is an extension of the International Patent Classification (IPC).

International patent classification [Database] - 7th ed.
International Intellectual Property Organization \ [ca. 2002]
patents - classification - thesauri - classification systems

This edition is used by patent offices since January 2000. The differences between the 6th and 7th edition are given in italics.

Internationale patent classificatie (IPC) / Bureau voor Industriele Eigendom [Database]
patents - classification systems

This is the electronic version of the Dutch IPC (hereafter called IPC-NL). You can leaf through it, it is not a database-like searching system. In the future this possibility will be enabled.

Manual of U.S. patent classification [Monograph]
United States Patent and Trademark Office (USPTO) \ 2003
patents - handbooks - usa - classification systems

You can use the "FirstGov" query to search the Patent Classification web site. You can also restrict your search to the Index to the USPC by choosing the Index to Classification option from the dropdown menu.

PRS codes description : EPIDOS-INPADOC Patent Register Service [Database]
patents - intellectual property rights - classification

Legal status codes for British, German and European patents.

U.S. patent classes by number [Database]
patents - intellectual property rights - classification systems

There is a link to the U.S. patent classes by title

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