| 摘要 |
1,198,831. Pitch composition. E. I. DU PONT DE NEMOURS & CO. 30 Aug., 1967 [31 Aug., 1966], No. 39588/67. Heading C3N. [Also in Division C1] A composition for repairing furnaces is made by slurrying a mixture of chrome ore and prefired magnesia-chrome ore mixture with pitch in diammonium phosphate solution. |
