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| Number | Title | Issue Date |
| 4547295 | Filtration of wet process superphosphoric acid Filtration of wet process superphosphoric acid by vacuum filtration is greatly enhanced by the use of a filter aid having a statistically selected distribution of particle sizes.... | 10/15/1985 |
| 4425003 | Single well-multiple cavity solution mining of an inclined structure A method of solution mining a bed of soluble ore disposed in a sloping subterranean strata disposed beneath an insoluble stratum by developing contemporaneous multiple cavities through the same borehole.... | 01/10/1984 |
| 4418960 | Multiple-bed solution mining of an inclined structure Solution mining method particularly adapted for recovery of potash and the like from multiple beds of relatively thin, inclined strata at substantial depths. Dissolution of each ore strata overlain by an insoluble and impermeable strata takes place throug... | 12/06/1983 |
| 4411474 | Solution mining of an inclined structure Solution mining method particularly adapted for recovery of potash and the like from relatively thin, inclined strata at substantial depths and involving the dissolution of ore strata, overlain by insoluble strata, while leaving the remainder of the forma... | 10/25/1983 |
| 4395828 | Combination geodetic transit compass and signal mirror A geodetic compass having a mirrored cover that has the dual purpose of providing means for reading the compass needle orientation for geodetic purposes, while at the same time having cross hatch diffractional sighting means incorporated in said cover and... | 08/02/1983 |
| 4377640 | Sulphur gas geochemical prospecting A method of geochemical prospecting for buried sulphur mineralization which comprises collecting relatively organic free soil samples, desorbing bound sulphur gases from the soil samples, and analyzing the sulphur gases.... | 03/22/1983 |
| 4353260 | Shield for gas sampling probe A shield for a gas sampling probe is disclosed. The shield includes a tubular member which substantially encloses the probe. Openings are provided in the tubular member to permit a gas flow into the shield past the probe.... | 10/12/1982 |
| 4314978 | Increased production of wet process phosphoric acid by gelatin addition An improved method for the production of wet process phosphoric acid wherein the addition of relatively small amounts of gelatin to the reaction system substantially increases the filtration rate of the calcium sulphate crystals without adversely affectin... | 02/09/1982 |
| 4302483 | Metallizing of a corrodible metal with a protective metal An apparatus and method for spray metallizing a coating of metal (e.g., zinc) onto one or both sides of a base metal (e.g. steel). One embodiment of the invention comprises melting the metal to be deposited, propelling first and second streams of the melt... | 11/24/1981 |
| 4295881 | Process for extraction of platinum group metals from chromite-bearing ore A process for treating chromite-bearing ores to obtain useful mineral values, especially platinum group metal, therefrom wherein the ore is separated into magnetic and non-magnetic fractions; the non-magnetic fraction, containing a substantial portion of ... | 10/20/1981 |
| 4289612 | Phosphate ore triple float A process for the improved beneficiation of phosphate ore in which the double float cationic (i.e., amine) floatation step is performed in two stages instead of the standard single stage, and which permits recovery of approximately two-thirds of the phosp... | 09/15/1981 |
| 4269867 | Metallizing of a corrodible metal with a protective metal An apparatus and method for spray metallizing a coating of metal (e.g. zinc) onto one or both sides of a base metal (e.g. steel) which comprises melting the metal to be deposited, propelling first and second streams of the melted metal towards the base me... | 05/26/1981 |
| 4268088 | Shortwall mining of trona A method of mining substantially horizontal beds of trona ore, such as are found in the vicinity of the town of Green River, Wyoming, in which substantially all the ore within a given area is extracted. Mining is accomplished by driving substantially para... | 05/19/1981 |
| 4252622 | Continuous process for the purification of zinc plants electrolytes using copper arsenates Continuous process for the purification of zinc plant electrolyte employing copper arsenate for the removal of cobalt and associated impurities in a four-step treatment comprising: (1) cementation of copper with fine zinc dust, (2) precipitation of the major p... | 02/24/1981 |
| 4240826 | Process for the recovery of arsenic as a zinc arsenate and its _utilization in the purification of zinc plant electrolytes The invention described herein relates to metallurgical processes for the recovery of zinc arsenate from cement copper cake residues, and the use thereof in the purification of impure zinc electrolyte.... | 12/23/1980 |
| 4225342 | Treatment of zinc plant leach residues for recovery of the contained metal values A process for treating zinc plant leach residues for the recovery of the lead, silver, and tin values contained therein is disclosed. The process includes the treatment of the zinc plant residue with concentrated sulphuric acid followed by water leaching ... | 09/30/1980 |
| 4202667 | Process for the separation of insoluble materials in the production of soda ash An improved process for the production of soda ash from trona including the steps of sizing the trona, heating the trona to eliminate water and carbon dioxide therefrom, dissolving the trona in an aqueous medium to obtain a solution thereof, removing inso... | 05/13/1980 |
| 4177067 | Recovery of silver, copper and zinc from partially roasted pyrite concentrate by ferric sulphate leaching A process for treating a pyrite concentrate containing silver, copper and zinc to recover the metals contained therein is disclosed. The process includes the partial roasting of the concentrate to open the pyrite matrix to solution penetration followed by... | 12/04/1979 |
| 4168969 | Recovery of silver, copper, zinc and lead from partially roasted pyrite concentrate by acid chloride leaching A process for treating a pyrite concentrate containing silver, copper, lead and zinc to recover the metals contained therein is disclosed. The process includes the partial roasting of the concentrate to open the pyrite matrix to solution penetration follo... | 09/25/1979 |
| 4160812 | Multi-stage crystallization of sodium carbonate Sodium carbonate is crystallized in multi-stage evaporative crystallizers from a pregnant liquor process solution typically obtained by dissolving calcined crude trona in water, separating insoluble impurities, and removing the majority of organic matter ... | 07/10/1979 |
| 4158043 | Process for producing soda ash from natural alkali metal carbonate-containing ores Described herein is a process for producing soda ash (sodium carbonate) from natural ores such as trona in which separate soda ash products are produced having differing purities. According to the invention, a substantially purified and saturated solution... | 06/12/1979 |
| 4083934 | Process for obtaining pure orthophosphoric acid from superphosphoric acid A process for obtaining pure orthophosphoric acid from superphosphoric acid is provided comprising: (a) hydrolyzing superphosphoric acid with water until a mixture of polyphosphoric acids and orthophosphoric acid is formed, wherein the total P2... | 04/11/1978 |
