THE PATENTS ACT, 1970
Section 45

Date of patent

(1) Subject to the other provisions contained in this Act, every patent shall be dated as of the date on which the application for patent was filed.

(2) The date of every patent shall be entered in the register.

(3) Notwithstanding anything contained in this section, no suit or other proceeding shall be commenced or prosecuted in respect of an infringement committed before the date of publication of the application.