| PATENT ASSIGNEE'S COUNTRY | Japan |
| UPDATE | 07.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
Mfg process from aq formol soln - Passing aq formol soln having metallic impurities therein as a descending stream through an ion-exchange vessel contg an ion-exchange material & bringing the said soln into contact with ion-exchange material & thereby removing said impurities - Passing pure aq formol soln as ascending stream through reaction vessel contg solid acid catalyst |
| PATENT PHOTOCOPY | Available on request |
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