Master Classification File (MCF) / Patent Application (Patent Application Sequence) - Current U.S. classification information for all patent application publications (non-provisional utility and plant) published by the U.S. Patent and Trademark Office from March 15, 2001 to Present. Approximately 450 main divisions of technology, called classifications/classes, broken into approximately 150,000 subdivisions, called subclassifications/subclasses. Provided in published patent application number sequence (ascending) with the current U.S. original classification/subclassification and any cross-reference classification/subclassifications. The format is ASCII text. Available on or before the 15th of each odd month and contains data through the end of the previous even month. Each new bimonthly file totally replaces the previous file. Approximately 23 MB (compressed) per bimonthly file. Master Classification File (MCF) / Patent Grant (Patent Grant Sequence or Classification Sequence) - Current U.S. classification information for all patent grants issued by the U.S. Patent and Trademark Office from 1790 to Present. Approximately 450 main divisions of technology, called classifications/classes, broken into approximately 150,000 subdivisions, called subclassifications/subclasses. Provided in patent grant sequence (ascending) by patent grant number with the current U.S. original classification/subclassification and any cross-reference classification/subclassifications or by classification sequence (ascending) by U.S. classification/subclassification (original and cross reference) followed by patent grant number. The format is ASCII text. Available on or before the 15th of each odd month and contains data through the end of the previous even month. Each new bimonthly file totally replaces the previous file. Approximately 121 MB (compressed) per bimonthly file. Manual of Classification (a.k.a., Classification Text Attribute File (CTAF)) - Numbers and descriptive titles of the patent classifications and subclassifications (classes/subclasses) for approximately 450 classes and approximately 150,000 subclasses of the U.S. Patent Classification (USPC) System. This file is the electronic version of the paper version of the Manual of Classification. The format is ASCII text. Available on or before the 15th of each odd month and contains data through the end of the previous even month. Each new bimonthly file totally replaces the previous file. Approximately 2.9 MB (compressed) per bimonthly file. Index to U.S. Patent Classification (a.k.a., Classification Index File) - Alphabetical list of subject headings which refer to specific classifications and subclassifications (classes/subclasses) of the U.S. Patent Classification System - (i.e., technology categories). Also known as, the Classification or Class Index File. There are approximately 67,000 terms contained in this index. The format is ASCII text. Available on or before the 15th of each odd month and contains data through the end of the previous even month. Each new bimonthly file totally replaces the previous file. Approximately 1.1 MB (compressed) per bimonthly file.