law: Patents Act, 1970
  16. Power of Controller to make orders respecting division
  
  of application
  (1) A person who has made an application for a patent under this
  
  Act may, at any time before the acceptance of the complete specification, if he
  
  so desires, or with a view to remedy the objection raised by the Controller on
  
  the ground that the claims of the complete specification relate to more than
  
  one invention, file a further application in respect of an invention disclosed
  
  in the provisional or complete specification already filed in respect of the
  
  first-mentioned application.
  (2) The further application under sub-section (1) shall be
  
  accompanied by a complete specification but such complete specification shall
  
  not include any matter not in substance disclosed in the complete specification
  
  filed in pursuance of the first-mentioned application.
  (3) The Controller may require such amendment of the complete
  
  specification filed in pursuance of either the original or the further
  
  application as may be necessary to ensure that neither of the said complete
  
  specification includes a claim for any matter claimed in the other.
  Explanation:  For the purposes of this Act the further
  
  application and the complete specification accompanying it shall be deemed to
  
  have been filed on the date on which the complete specification in pursuance of
  
  the first mentioned application had been filed, and the further application
  
  shall, subject to the determination of the priority date under sub-section (4)
  
  of section 11, be proceeded with as a substantive application.