| PATENT ASSIGNEE'S COUNTRY | Japan |
| UPDATE | 12.99 |
| PATENT ASSIGNEE | Mitsui Mining & Smelting (Tokyo) |
| PATENT CLAIMS |
Mfg method - Mixing a suspension contg BaSO4 particles having speci fic surface area 0.1-150 square.m/g in concn 10-1000 g/l with alkaline soln contg compd of Sn(IV) in concn 1-95% - Adjusting pH 11-14 - Adjusting pH of mixt to 1-5 by addition of acid to thus give a ppcc - Separating ppcc - Drying - Calcining ppcc in inert atm |
| PATENT PHOTOCOPY | Available on request |
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