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The Patent Cooperation Treaty (PCT) is an international patent law treaty, concluded in 1970. It provides a unified procedure for filing patent applications to protect inventions in each of its contracting states. A patent application filed under the PCT is called an international application, or PCT application. A single filing of a PCT application is made with a Receiving Office (RO) in one language. It then results in a search performed by an International Searching Authority (ISA), accompanied by a written opinion regarding the patentability of the invention, which is the subject of the application. It is optionally followed by a preliminary examination, performed by an International Preliminary Examining Authority (IPEA). Finally, the relevant national or regional authorities administer matters related to the examination of application (if provided by national law) and issuance of patent. 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.〔(''Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)'' ), item 45.〕 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. The contracting states, the states which are parties to the PCT, constitute the International Patent Cooperation Union.〔 ==History== The Washington Diplomatic Conference on the Patent Cooperation Treaty was held in Washington from 25 May to 19 June 1970. The Patent Cooperation Treaty was signed on the last day of the conference on 19 June 1970. The Treaty entered into force on 24 January 1978, initially with 18 contracting states.〔World Intellectual Property Organization, ''The First Twenty-five Years of the Patent Cooperation Treaty (PCT) 1970–1995'', 1995, ISBN 92-805-0601-3, page 141.〕 The first international applications were filed on 1 June 1978.〔 The Treaty was subsequently amended in 1979, and modified in 1984 and 2001. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Patent Cooperation Treaty」の詳細全文を読む スポンサード リンク
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