The patent cooperation treaty (PCT) is a multilateral treaty entered into force in 1978. Through PCT, an inventor of a member country (Contracting state of PCT can simultaneously obtain priority for his/her Invention in all/ any of the member countries, without having to file a separate application in the countries of interest , by designating them in the PCT application .India joined the PCT on December 7, 1998. All activities related to PCT are coordinated by the World Intellectual Property Organization (WIPO) situated in Geneva. In order to protect your invention in other countries, you are required to file an independent patent application in each country of interest; in some cases , within a stipulated time to obtain priority in these countries .This would entail a large investment, within a short time, to meet costs towards filing fees, translation, attorney charges etc. In addition you are making an assumption which, due to the short time available for making the decision on whether to file a patent application in a country or not, may not be well founded. Inventors of Contracting States of PCT on the other hand can simultaneously obtain priority for their inventions without having to file separate application in the countries of interest ; thus saving the initial investments towards filing fees, translation etc. In addition the system provides much longer time for filing patent application in member countries . The time available under Paris Convention for securing priority in other countries is 12 months from the date of initial filing. Under the PCT, the time available could be as much as minimum 20 and maximum 31 months. Further, an inventor is also benefited by the search report prepared under the PCT system to be sure that the claimed invention is novel. The inventor could also opt for preliminary examination before filing in other countries to be doubly sure about the patentability of the invention. The patent office or nay other office designated by each contracting state becomes a receiving office for receiving patent applications These applications are referred to International Searching Authorities (ISA) which usually the patent offices, appointed to carry out the patent search on a global basis. In case the receiving office is also an ISA, a separate referral is not required . There is also a provision to get a patent application examined by international preliminary Examining Authorities which, in most cases are ISA. A search report on the patent application filed with a receiving office is received by the applicant/inventor 16 months after the priority date which is nothing but the date of submitting the application in the receiving office. The International Bureau of the WIPO publishes the application and the search report 18 months after the priority date. The original application is then sent to the designated offices indicated in the application. Within two months of this i.e. by the 20th month, the applicant will have to formally apply to the patent offices of these countries for grant of patents by paying official fees and completing other formalities stipulated by these offices (some countries). In case translated copies of the application are required, the same has to be furnished by the applicant. Inspite of submitting the request for grant of patents in designated countries in the 20th month after the priority date, the priority in these countries is the same as the date of filing the original PCT application. If applicant/inventor has requested for an examination report, the report is usually received by the applicant /inventor about 28 months after the priority date. Within two months of this, the applicant/inventor will have to formally apply for grant of patents in designated countries .The priority of the application is maintained in the designated countries.
 (a) By the end of the 20th to 31st month the applicant is in a better position to assess the quality of the invention being protected as a detailed search report or an examination report or both would be available to help making an assessment.
(b) Applicants can re-evaluate their decision about filing applications in all the designated countries after a long gap of 20 to 31 months.
(c ) If not satisfied, applicants may decide to drop a few countries from the list. This decision would also be influenced by the changing market conditions.
(d ) Applicants can delay their investment in respect of the national phase or the regional phase applications by 20 to 31 months without sacrificing priority.
