Under Section 102(2) of the Patents Act, 1970, notice of acquisition shall be given:

Section 102(2) says notice of the acquisition "shall be given to the applicant, and, where a patent has been granted, to the patentee and other persons, if any, appearing in the register as having an interest in the patent". Notice to the patentee alone is not enough, and the Controller is not the person to whom the notice is addressed.