Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4210421 | Method for reducing kcl tailings loss from evaporation Disclosed is an improved method of concentrating with respect to a first salt an aqueous solution containing the first salt and a second salt, the solubility of the first salt increasing more with increasing temperatures than the solubility of the second ... | 07/01/1980 |
| 4088451 | Concentration of underground brines in situ by solar evaporation A process is provided for the recovery of chemicals, such as chlorides, sulfates, carbonates and borates of such alkali metals as sodium and potassium, among others, from underground brines associated with an ore body containing said chemicals, wherein th... | 05/09/1978 |
| 4087253 | Method of obtaining caustic soda from a sodium chloride liquor containing sulphate ions recovered from an electrolytic cell A method of obtaining caustic soda and pure sodium chloride from an electrolytic cell liquor containing also sulfate ions including the steps of concentrating the liquor through multiple effect evaporation, cooling the concentrate obtained, separating the... | 05/02/1978 |
| 4072472 | Production of high purity salt from high sulfate salt deposits A subterranean salt deposit is solution mined, and the resulting calcium- and sulfate-contaminated brine is treated, e.g., by soda ash, to precipitate insoluble calcium compounds. The resulting slurry is settled, and the effluent clear brine is evaporated... | 02/07/1978 |
| 4065270 | Process for purifying sodium hydroxide An aqueous solution of sodium hydroxide containing soluble impurities such as a concentrated catholyte produced by a diaphragm electrolysis is cooled by a coolant or a heat-exchanger to form a slurry containing sodium hydroxide hydrate crystals and fine i... | 12/27/1977 |
| 4026676 | Process for producing salt having a reduced calcium sulfate content A process for preparing from aqueous NaCl brine containing appreciable quantities of dissolved calcium sulfate high purity dendritic salt, characterized by an exceptionally low calcium sulfate content. The process is carried out by a "feed and bleed" proc... | 05/31/1977 |
| 3986923 | Removal of dissolved salts from sulphide liquors Sodium chloride is removed from Kraft mill smelts by fractionating the smelt to separate sodium carbonate and sodium sulphate in solid form from sodium sulphide and sodium chloride which usually is contaminated with residual quantities of sodium carbonate... | 10/19/1976 |
| 3981818 | Crystalline materials A composition of matter transparent to infrared rays and shock resistant which is a directionally grown, polycrystalline solidified melt of a eutectic composition comprising at least two components wherein the ratio of the index of refraction of one to th... | 09/21/1976 |
| 3977835 | Cooling process for selective salt crystallization Salable salt values in a complex brine are recovered by cooling to crystallize mirabilite, then using solar evaporations to recover readily processable groupings of sodium salts and potassium salts.... | 08/31/1976 |
| 3967930 | Separation of complex potassium salts from brine evaporites Evaporite minerals comprising mixtures of relatively coarse salts are treated in a manner such that certain of said salts are converted by recrystallization to very finely divided form and then separated from the coarse salts by size classification such a... | 07/06/1976 |
| 3966541 | Concentration of underground brines in situ by solar evaporation A process is provided for the recovery of chemicals, such as chlorides, sulfates, carbonates and borates of such alkali metals as sodium and potassium, among others, from underground brines associated with an ore body containing said chemicals, wherein th... | 06/29/1976 |
| 3966539 | Process for extracting dissolved salts from water Evaporation of water from a salt-saturated liquid is facilitated by adding a particulate solid having a density greater than that of the saturated liquid, and by maintaining a thin surface layer of liquid by settlement of the solids to leave an optimum on... | 06/29/1976 |
| 3965247 | Recovery of sodium nitrite from by-product process liquors containing sodium chloride According to the present invention, sodium nitrite is recovered from an aqueous solution containing dissolved sodium nitrite and sodium chloride by a process which comprises subjecting said solution to crystallization in a first crystallization zone under... | 06/22/1976 |
| 3963424 | Cooling aqueous alkali metal hydroxide liquors by vacuum evaporation with subsequent solids precipitate removal A method and apparatus for cooling aqueous alkali metal hydroxide liquors such as, for example, caustic soda liquors, involving the vacuum cooling of a body of such liquor in an evaporating chamber having a overhead vapor outlet which communicates with a ... | 06/15/1976 |
| 3954552 | Removal of sodium chloride from pulp mill systems Smelts produced in spent pulping liquor recovery operations and containing sodium chloride are treated to remove sodium chloride therefrom in pure form while the loss of usable components is avoided. A solid mixture of sodium chloride, sodium carbonate an... | 05/04/1976 |
| 3953570 | Process for the treatment of carburizing salt wastes This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at el... | 04/27/1976 |
| 3950490 | Process for the treatment of carburizing salt wastes This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at el... | 04/13/1976 |
| 3937733 | Salts of iodomethanesulfonic acid with organic bases Salts of iodomethanesulfonic acid and an organic base, more particularly, glucamine, N-alkyl- and N, N-dialkylglucamines and N-hydroxyalkyl- and N,N-di-hydroxyalkylglucamines, are useful as X-ray contrast agents, especially for spinal X-ray examination.... | 02/10/1976 |
