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Four WIPO classification systems: International Patent Classification (IPC), Nice Classification, Locarno Classification, Vienna Classification. The Strasbourg Agreement (of 1971) concerning the International Patent Classification provides for a common classification for patents for invention including published patent applications, utility models and utility certificates. The International Patent Classification (IPC) is a hierarchical system in which the whole area of technology is divided into a range of sections, classes, subclasses and groups. This system is indispensable for the retrieval of patent documents in the search for establishing the novelty of an invention or determining the state of the art in a particular area of technology.
This service provides access to published PCT international applications from the first publication in 1978.