law: Patents Act, 1970
  5. Inventions where only methods or processes of
  
  manufacture patentable.
   1  [(1)] In the case of inventions-
  (a) claiming substances intended for use, or
  
  capable of being used, as food or as medicine or drug, or
  (b) relating to substances prepared or
  
  produced by chemical processes (including alloys, optical glass,
  
  semi-conductors and inter-metallic compounds), no patent shall be granted in
  
  respect of claims for the substances themselves, but claims for the methods or
  
  processes of manufacture shall be patentable.
   2  [(2) Notwithstanding anything contained in sub-section
  
  (1), a claim for patent of an invention for a substance itself intended for
  
  use, or capable of being used, as medicine or drug, except the medicine or drug
  
  specified under sub-clause (v) of clause (1) of sub-section (1) of section 2,
  
  may be made and shall be dealt, without prejudice to the other provisions of
  
  this Act, in the manner provided in Chapter IVA.]