(19)
(11) EP 1 365 993 A1

(12)

(43) Date of publication:
03.12.2003 Bulletin 2003/49

(21) Application number: 02714877.4

(22) Date of filing: 13.02.2002
(51) International Patent Classification (IPC)7C01F 11/18, C01F 5/24, C01B 31/24
(86) International application number:
PCT/US0204/168
(87) International publication number:
WO 0206/4505 (22.08.2002 Gazette 2002/34)
(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

(30) Priority: 13.02.2001 GB 0103500

(71) Applicants:
  • Imerys Minerals Limited
    St. AustellCornwall PL25 4DJ (GB)
  • Mortimer, Mark, Daniel
    Austell, Cornwall PL25 3NN (GB)

(72) Inventors:
  • GOLLEY, Christopher, R.L.
    Sandersville, GA 31082 (US)
  • THRALE, Deborah, Susan
    South Gloucestershire England BS375XU (GB)
  • MORTIMER, Mark, Daniel
    St. Austell,Cornwall PL25 3NN (GB)
  • PAYTON, Desmond, Charles
    St. Austell, Cornwall PL25 3UR (GB)
  • PEREZ, Florangel, D.
    Earth City, MO 63045 (US)
  • WINDEBANK, Mark
    Par, Cornwall England PL25 4DJ (GB)

(74) Representative: Brown, David Leslie 
Haseltine, Lake & Co,Imperial House,15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB)

   


(54) PROCESS FOR REDUCTIVE BLEACHING OF ALKALINE EARTH METAL CARBONATES