Novartis has received an Indian Patent Number 203536 (the ‘536 patent) titled Benflumetol derivatives against its patent application numbered IN/PCT/2000/884/CHE via PCT national phase. The ‘536 patent is directed to compound of formula I claiming priority from Swiss Patent Application No. 1351/98 dated June 25, 1998. The ‘536 patent is a mail-box application filed under section 5(2) of the Patents Act, 1970 which was later deleted by the Patents (Amendment) Act, 2005. The application for the ‘536 patent entered Indian national phase via International Application No. PCT/EP1999/004355 filed June 23, 1999 and published as WO1999/067197 dated December 29, 1999. The ‘536 patent is Indian equivalent of the U.S. Patent No. 6,329,552.