The PCT procedure includes:
1. Filing: File an international application with a RO/IN national patent Office or directly with International Bureau (IB) of WIPO, complying with the PCT formality requirements and fees. In India PCT application are filed at appropriate patent offices decided on the basis of territorial limits (Rule 4, Indian Patent Act 1970 as amended and patent Rules 2003 as amended).
2. International Search: An ―International Searching Authority‖ (ISA) identifies the published patent documents and technical literature (―prior art‖) which may have an influence on whether your invention is patentable, and establishes a written opinion on your invention‘s potential patentability. Indian Patent office, Delhi Branch performs the function of ISA on receipt of prescribed fee specified in Fifth Schedule of patent act 1970 as amended and patent rules 2003 as amended.
3. International Publication: After expiration of 18 months from the earliest filing date (Priority Date), the content of your international application is disclosed to the world.
4. International Preliminary Examination (optional): one of the ISAs on request carries out an additional patentability analysis, usually on an amended version of your application. Indian Patent office, Delhi Branch performs the function of International Preliminary Examination (IPEA) on receipt of prescribed fee specified in Fifth Schedule of patent act 1970 as amended and patent rules 2003 as amended.
5. National Phase: After the end of the international PCT procedure, usually at 30 months from the earliest filing date of your initial application, from which you claim priority, you start to pursue the grant of your patents directly before the national (or regional) patent Offices of the countries in which you want to obtain them.
6. In India, 31 months is maximum time limit to enter national phase. To enter national phase an application corresponding to an international application is made in Form 1.
