Patent Cooperation Treaty (PCT) is an International Patent Law Treaty established in 1970 in order to give each invention their right to protect by registering by filing an International application or called PCT application. PCT filing is made by through a single application form by the help of a Receiving Officer (RO) of a particular state and then followed by a professional patent search by the International Searching Agency (ISA) in order to register the proposed patent. Primarily, Patent Cooperation Treaty (PCT) is j8ust an agreement for mutual cooperation at an international level in the field of patent filing and registration. Therefore, PCT filing is a procedure and it should be carefully followed by all countries across the world. PCT filing in India has some different rules and regulations as the filing should be done within the 31 months of the priority dates in the designated states. The PCT application should be accompanied with all rules and regulations relating to that particular country for better process and easy management of the PCT filing.