law: Patents Act, 1970
  18. Powers of Controller in cases of anticipation
  (1) Where it appears to the Controller that the invention so far
  
  as claimed in any claim of the complete specification has been anticipated in
  
  the manner referred to in clause (a) of sub-section (1) or sub-section (2) of
  
  section 13, he may refuse to accept the complete specification unless the
  
  applicant-
  (a) shows to the satisfaction of the
  
  Controller that the priority date of the claim of his complete specification is
  
  not later than the date on which the relevant document was published; or
  (b) amends his complete specification to the
  
  satisfaction of the Controller.
  (2) If it appears to the Controller that the invention is
  
  claimed in a claim of any other complete specification referred to in clause
  
  (b) of sub-section (1) of section 13, he may, subject to the provisions
  
  hereinafter contained, direct that a reference to that other specification
  
  shall be inserted by way of notice to the public in the applicant's complete
  
  specification unless within such time as may be prescribed-
  (a) the applicant shows to the satisfaction of
  
  the Controller that the priority date of his claim is not later than the
  
  priority date of the claim of the said other specification; or
  (b) the complete specification is amended to
  
  the satisfaction of the Controller;
  (3) If it appears to the Controller, as a result of an
  
  investigation under section 13 or otherwise-
  (a) that the invention so far as claimed in
  
  any claim of the applicant's complete specification has been claimed in any
  
  other complete specification referred to in clause (a) of sub-section (1) of
  
  section 13; and
  (b) that such other complete specification was
  
  published on or after the priority date of the applicant's claim, then, unless
  
  it is shown to the satisfaction of the Controller that the priority date of the
  
  applicant's claim is not later than the priority date of the claim of that
  
  specification, the provisions of sub-section (2) shall apply thereto in the
  
  same manner as they apply to a specification published on or after the date of
  
  filing of the applicant's complete specification.
  (4) Any order of the Controller under sub-section (2) or sub-section
  
  (3) directing the insertion of a reference to another complete specification
  
  shall be of no effect unless and until the other patent is granted.