(19)

(11)

EP 1 487 953 A1

(12)

(43) Date of publication: 22.12.2004 Bulletin 2004/52 (21) Application number: 02717011.7 (22) Date of filing: 26.03.2002

(51) International Patent Classification (IPC)7: C11D 3/14, C11D 3/382, C11D 3/10, C11D 3/12 (86) International application number: PCT/IB2002/001164 (87) International publication number: WO 2003/080787 (02.10.2003 Gazette 2003/40)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (71) Applicant: Council of Scientific andIndustrial Research New Delhi 110 001 (IN)

(72) Inventors: SEN, Raja Dhanbad,P.O.F.R.I. 828108, Jharkhand (IN) BHATTACHARJEE, Ujjal Dhanbad,P.O.F.R.I. 828108, Jharkhand (IN) CHOUDHURY, Deba, Priya Dhanbad,P.O.F.R.I. 828108, Jharkhand (IN) NANDI, Lakshmi, Narayan Dhanbad,P.O.F.R.I. 828108, Jharkhand (IN) MAITRA, Saikat Dhanbad,P.O.F.R.I. 828108, Jharkhand (IN) (74) Representative: Fairbairn, Angus Chisholm  Marks & Clerk,57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)