By "preclassification" is meant a first stage of routingclassification, for purposes of internal application (file) routing and distribution handling, whereby the subject of the claimed invention (or the invention first claimed, if there is more than one) is broadly identified by means of the appropriate classification symbols.
By "officialIPC classification" is meant the assigning of the appropriate classification symbols according to the International Patent Classification (IPC), published by WIPO. See the WIPO website for the IPC edition in force, and the "Guide to the IPC", which sets forth principles and rules of classification.
By "CPC classification" is meant the assigning of the appropriate classification symbols according to the Cooperative Patent Classification (CPC), published by the EPO and the USPTO. See the CPC website for the CPC edition in force, and the "Guide to the CPC", which complements the "Guide to the IPC" in that it covers the distinguishing features of the CPC compared to the IPC. identifying the technical subject of the claimed invention (or of the subjects of each of the claimed inventions, if there is more than one), such identification being as precise and comprehensive as the classification permits. In addition, non-obligatory classification or indexation symbols may be attributed to any additional information contained in the document to be classified, which should be identified according to the Guide to the International Patent Classification ("IPC") published by WIPO (see also the WIPO website). The official classification of the European patent application is performed by the examiner, using the classification symbols contained in the rules of the IPC for the inventions as claimed ("Obligatory Classification"). He can also assign appropriate classification symbols and/or indexing codes to any additional information ("Non-Obligatory Classification") as defined in the Guide to the IPC in force at the time.