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| Number | Title | Issue Date |
| 4929582 | Hydrous oxide ion-exchange compound catalysts A catalytic material of improved activity which comprises a hydrous, alkali metal or alkaline earth metal or quaternary ammonium titanate, zirconate, niobate, or tantalate, in which the metal or ammonium cations have been exchange with a catalytically eff... | 05/29/1990 |
