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| Number | Title | Issue Date |
| 4057494 | Removal of chromium, chromate, molybdate and zinc Trivalent chromium, zinc, hexavalent chromate and molybdate can be removed from a fluid by contacting the fluid with an ion exchange resin bed comprising a mixture of a weak base anion exchange resin and a weak or strong acid cation exchange resin in hydr... | 11/08/1977 |
| 3984313 | Preferential removal of ammonia and phosphates Sewage water containing many pollutants including ammonia and phosphates is treated so that the ammonia and phosphates are preferentially removed through ion exchange while the other contaminants are allowed to remain in the water. Ferric hydroxide is dep... | 10/05/1976 |
| 3972810 | Removal of chromium, chromate, molybdate and zinc Trivalent chromium, hexavalent chromate, molybdate and zinc are removed from a fluid. The fluid is simultaneously treated with a weak base anion exchange resin and a weak acid cation exchange resin to remove the chromium, chromate, molybdate and/or zinc.... | 08/03/1976 |
