A patent is a legal document that gives the right or authority over a particular field of research, invention, or any other process, to a person applying for it. An application for this purpose generally comprises of a description of the invention, added with official forms and correspondence relevant to the application. Patent applications are of several types like Provisional Application, Ordinary or Non-Provisional Application, Convention Application, PCT International Application, PCT National Phase Application, Patent of Addition, Divisional Application and each one of them caters to a unique purpose.