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| Number | Title | Issue Date |
| 3988354 | Method of isolating granular anthraquinone from anthraquinone production process gases A method of isolating granular anthraquinone from anthraquinone production process gases which consists of passing said gasses through a fluidized bed of anthraquinone granules at a temperature of 110° to 160° C. While the gas is being passed through th... | 10/26/1976 |