Every application for a patent shall be for one invention only and shall be made in the prescribed form and filed in the patent office.

Every international application under the Patent Cooperation Treaty for a patent, as may be filed designating India shall be deemed to be an application, if a corresponding application has also been filed before the Controller in India.

Where the application is made by virtue of an assignment of the right to apply for a patent for the invention, there shall be furnished with the application, or within such period as may be prescribed after the filing of the application, proof of the right to make the application.