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U.S. Patent Application Cooperative Patent Classification (CPC) Master Classification File (MCF)

The U.S. Patent Application Cooperative Patent Classification (CPC) Master Classification File contains CPC classification information for all Utility patent application publications published by the U.S. Patent and Trademark Office (USPTO). It is available as XML with schemas or text monthly (usually by the 15th of the month). The records in each file are sorted first by patent application publication number ascending and kind code. For the same patent application publication number and kind code, the records are sorted by symbol position (F - First or L - Later); Among Later records, they were sorted by classification symbol and combination sets. The Later records not in combination set are sorted by classification value (I - Invention or A - Additional), then by classification symbol order ascending. In a combination set, the records are sorted by group number and rank number.


File NameFile Size (bytes)Posting Date
US_PGPub_CPC_MCF_XML_2016-03-31.zip289,922,06404/07/2016
US_PGPub_CPC_MCF_Text_2016-03-31.zip149,695,97604/07/2016
US_PGPub_CPC_MCF.docx41,12704/07/2016
US_PGPub_CPC_MCF.doc139,26404/07/2016

U.S. Patent Grant Cooperative Patent Classification (CPC) Master Classification File (MCF)

The U.S. Patent Grant Cooperative Patent Classification (CPC) Master Classification File contains CPC classification information for all Utility patent grants issued by the U.S. Patent and Trademark Office (USPTO). It is available as XML with schemas or text monthly (usually by the 15th of the month). The records in each file are sorted first by patent number ascending and kind code. For the same patent number and kind code, the records are sorted by symbol position (F - First or L - Later); Among Later records, they were sorted by classification symbol and combination sets. The Later records not in combination set are sorted by classification value (I - Invention or A - Additional), then by classification symbol order ascending. In a combination set, the records sorted by group number and rank number.


File NameFile Size (bytes)Posting Date
US_Grant_CPC_MCF_XML_2016-03-31.zip425,242,14704/07/2016
US_Grant_CPC_MCF_Text_2016-03-31.zip210,013,37804/07/2016
US_Grant_CPC_MCF.docx37,57704/07/2016
US_Grant_CPC_MCF.doc124,41604/07/2016

U.S. Patent Application Master Classification File (MCF)

The U.S. Patent Application Master Classification File contains classification information on all patent applications published by the U.S. Patent and Trademark Office. The U.S Patent Application Master Classification File is available bimonthly (i.e., once every two months, usually by the second week in odd months).

This file is sorted by patent application document number sequence ascending. All of the Primary U.S. Classifications appear first followed by the Secondary U.S. Classifications.


File NameFile Size (bytes)Posting Date
USPatentApplMasterClass.docx17,77302/10/2015
mcfappl.zip31,724,99908/20/2015

U.S. Patent Grant Master Classification File (MCF)

The U.S. Patent Grant Master Classification File contains classification information on all patent grants issued by the U.S. Patent and Trademark Office. The U.S Patent Grant Master Classification File (MCF) is available bimonthly (i.e., once every two months, usually by the second week in odd months).

  • MCFPAT – This file is sorted first by patent number ascending and second by original “O” U.S. patent classification ascending.
  • MCFCLS – This file is sorted first by U.S. patent classification ascending and second by patent number ascending.
File NameFile Size (bytes)Posting Date
USPatentGrantMasterClass.docx19,82502/10/2015
mcfpat.zip118,750,36408/20/2015
mcfcls.zip111,960,01908/20/2015

U.S. Manual of Classification File (CTAF)

The U.S. Classification Text Attribute File (CTAF) contains the data from the Manual of Classification excluding notes. Data elements within a variable length record are defined below. The Manual of Classification File (CTAF) is available bimonthly (i.e., once every two months, usually by the second week in odd months).


File NameFile Size (bytes)Posting Date
USManualofClass.docx18,09002/10/2015
ctaf.zip2,828,14608/20/2015

Index to the U.S. Patent Classification File (a.k.a., U.S. Classification Index File (CLASINDX))

The Index to the U.S. Patent Classification File is based on the system used by the U.S. Patent and Trademark Office to classify patents. It is an alphabetical list of 67,800+ subject headings referring to specific classes and subclasses of the patent classification system. The Index to the U.S. Patent Classification File is available bimonthly (i.e., once every two months, usually by the second week in odd months).


File NameFile Size (bytes)Posting Date
IndextoUSPatentClass.docx19,78802/10/2015
clasindx.zip1,014,95108/20/2015

U.S. Patent Classification System - Classification Definitions

Explanation of Data.


The U.S. Patent Classification System (USPC) is used to classify patents granted by the U.S. Patent and Trademark Office. The USPC provides for the storage and retrieval of every U.S. patent document that a patent examiner needs to review when examining patent applications.


Please note that the USPC is updated regularly to better categorize patented technologies. As these definitions are updated, all existing U.S. patents granted since 1790 are reclassified to reflect these classification updates.


File NameFile Size (bytes)Posting Date
classdefs.zip73,138,09308/20/2015

Classification Orders

The Classification Orders are the official record of change for classes within the U.S. Patent Classification System (USPCS). The orders contain information on Abolished and Established classes and subclasses, Indent Changes, Position Changes, and Title Changes. Classification Orders are released to the patent community and to the general public on the first Tuesday of every month.


File NameFile Size (bytes)Posting Date
classordersindx.zip75,19308/20/2015
ClassOrdersIndx.docx20,31202/10/2015

U.S. Patent Classification to International Patent Classification Concordance (a.k.a., USPC to IPC Concordance)

Maps USPC to IPC classes.


File NameFile Size (bytes)Posting Date
uspc2ipcconcordance.zip321,75208/20/2015
USPC2IPCConcordance.docx26,87208/20/2015