Mention the procedure of PCT filing.

The first step of the procedure consists in filing an international (patent) application with a competent patent office, called a Receiving Office (RO). This application is called an international application or simply a PCT application since it neither results in an international patent nor in a PCT patent, neither of which exists. The PCT application needs to be filed in one language only, although a translation of the application may be required for the international search[20] and the international publication,depending on the language of filing and the competent or chosen International Searching Authority.

At least one applicant (either a physical or legal person) must be a national or resident of a contracting state to the PCT; otherwise, no PCT filing date is accorded.If a PCT filing date is erroneously accorded, the Receiving Office may, within four months from the filing date, declare that the application should be considered withdrawn.[24] The requirement that at least one applicant must be a national or resident of a contracting state to the PCT needs, however, "only to be complied with at the time of filing the international application. Later changes in the applicant's country of residence (or nationality) ... have no consequence on the validity of the international application itself."

In most member states, the applicant or at least one of the applicants of the application is required to be a national or resident of the state of the receiving office where the application is filed. Applicants from any contracting state may file a PCT application at the International Bureau in Geneva, subject to national security provisions.

Upon filing of the PCT application, all contracting states are automatically designated.[notes 1][notes 2] Subject to reservations made by any contracting state, a PCT application fulfilling the requirements of the treaty and accorded a PCT filing date has the effect of a regular national application in each designated state as of the PCT filing date, which date is considered to be the actual filing date in each designated _______ ______ ________ _________ ______ __________ ___ _______ ___ _______ ________.
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