A patent application is filed to obtain a filing number and a date of filing. The allotted date of filing and the filing number remain the two most important details related to a patent application or a granted patent during their entire lifetime. Since the introduction of Trade-Related Aspects of Intellectual Property Rights (TRIPS) agreement, all the major jurisdictions follow the first inventor to file system, which means that irrespective of when a particular technology was invented or co-invented by several different entities, the date of filing of the patent application would be regarded as the date of completion of invention, and the ownership of the technology will lie with the applicant who was the first to file it with the patent office.