Provisional Application - A provisional application, also known as a temporary application, is filed when an invention is still in the works and has not yet been finished. Any other relevant inventions will not be recognised as prior art to the inventor's application if a patent is filed early. When an invention requires more time to develop, this form of patent application is filed.

Ordinary or Non-Provisional Application - An ordinary or non-provisional application application does not have any priority to claim or if the application is not filed in pursuance of any preceding convention application. A complete specification can be submitted via:

Direct Filing - Wherein complete specification is initially filed with the Indian Patent Office without filing any corresponding provisional specification.

Subsequent Filing - Wherein complete specification is filed after the filing of the corresponding provisional specification and claiming priority from the filed provisional specification.

Convention Application - The convention application is filed for claiming a priority date based on the same or similar application filed in any of the convention countries.

To avail a status of the convention, an applicant must apply to the Indian Patent Office within a year from the date of the initial filing of a similar application in the convention country.

To re-iterate in simpler terms, a convention application entitles the applicant to claim priority in all the convention countries.

PCT International Application - PCT international application does not result in an international patent grant, it open the way for a shortened patent application process in multiple nations at once.