The IFI Uniterm and U.S. Class Reference file
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The IFI Uniterm and U.S. Class Reference file is a special reference file for the IFIALL file. IFIREF contains U.S. Patent Office (USPTO) classification codes and titles, plus authority data for general, fragment and compound Uniterms.
Database Summary Sheet: Concise description with all fields, all formats, many examples.
In addition to the STN General Terms & Conditions, please find the file-specific Usage Terms here.