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| Number | Title | Issue Date |
| 4844915 | Method for ESP brown plume control SOx /NOx pollution control reagent composition comprising from 0.1 to 25% urea in intimate admixture with dry, finely divided Nahcolite, a naturally occurring form of sodium bicarbonate. The composition is used in a process of removi... | 07/04/1989 |
| 4815790 | Nahcolite solution mining process Nahcolite solution mining process comprising drilling at least one well into a Nahcolite bed, circulating hot barren aqueous liquor in a cavity in said Nahcolite bed for a time sufficient to produce a pregnant liquor having an increase in the concentratio... | 03/28/1989 |
