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What is the relation between the Japanese FI and IPC?

April 26, 2017IPC Japanese relation

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What is the relation between the Japanese FI and IPC?

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FI or “File Index” is the internal classification system used by the Japanese Patent Office to classify their patent documentation and to organize prior-art searches more efficiently. FI classifications are made up of an International Patent Classification (IPC) sub-group, followed by an IPC subdivision symbol in the form of a three-digit number. These IPC subdivision symbols are unique to FI classes and are structured hierarchically. Optionally, a file discrimination symbol in the form of a letter can be added. With its various subdivisions, the File Index (FI) classification has about 170 000 classes, whereas the IPC has 70 000. FI and F-terms are available in English at http://www.ipdl.jpo.go.jp/Tokujitu/tjftermena.ipdl?N0000=114 or at http://www5.ipdl.jpo.go.