An international treaty, finalized in 1970, allowing a national or resident of a member country to file a single application in his/her own country, which can be filed in any member country at a later date. A patent application filed under the PCT is called an international application, or PCT application
A PCT application does not itself result in the grant of a patent, since there is no such thing as an “international patent”, and the grant of patent is a prerogative of each national or regional authority. In other words, a PCT application, which establishes a filing date in all contracting states, must be followed up with the step of entering into national or regional phases to proceed towards grant of one or more patents. The PCT procedure essentially leads to a standard national or regional patent application, which may be granted or rejected according to applicable law, in each jurisdiction in which a patent is desired.