PCT-National Phase Application:-

               PCT is an international filing system for patents in which the applicant gets an international filing date in all the designated countries conferring the late entry (up to 31 months) to the national offices without affecting the priority date. This is a simple and economical procedure for those applicants seeking protection for the inventions in many countries. Indian Patent Office is a receiving office for international applications by nationals or residents of India. An international application shall be filed with the appropriate office in triplicate in respect of he ad office and quadruplicate in respect of branch offices, either in English or in Hindi language Patent Registration Coimbatore. 

               An international application made according to Patent Cooperation Treaty designating India can enter national phase within 31 months from the international filing date. This application filed before the Controller in the Indian Patent Office claiming the priority and international filing date is called PCT National Phase application. Applicant can enter national phase with a request made on white paper. The filing date of the application ... shall be the international filing date accorded under the Patent Cooperation Treaty It is not mandatory for the applicant to submit the documents while entering the national phase for filing the application in the designated or elected member countries, as it is obligatory on the part of WIPO to send those things to the designated offices. However, for convenience and faster processing the applicant may submit the necessary documents. Office may ask for any other documents, which are necessary in addition to what was submitted along with the application Addition Patent Registration Coimbatore.

              When an applicant feels that he has come across an invention which is a slight modification on the invention for which he has already applied for / have patent the applicant can go for patent of addition since the invention does not involve a substantial inventive step. It is also possible to convert an independent patent to a patent of addition at a later date if the subject matter was an improvement in or modification to a main invention for which he holds a patent Patent Registration Coimbatore.

            A patent of addition remains in force only as long as the patent for the original invention emains in force and no renewal fees are payable in respect  thereof. Incase the original patent is revoked, the patent of addition may be made as independent patent by the authority ordering the evocation and it will continue thereafter for the unexpired terms of the original patent subject to the payment of the prescribed renewal fees. More details regarding Patents of addition is given in the later Chapter of this Booklet Patent Registration Coimbatore.