Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 4120737 | Manufacture of calcium sulphate alpha hemihydrate A process for the manufacture of calcium sulphate alpha-hemihydrate which comprises the step of interacting an aqueous solution of calcium chloride and a source of sulphate or bisulphate ions in an aqueous system at a temperature above the calcium sulphat... | 10/17/1978 |
| 4120934 | Method for working-up shale The invention is a method for working-up shale while recovering metals therefrom and the sulphur content thereof. The method comprises crushing the shale and leaching and roasting the shale. The sulphur content is oxidized and converted into sulphuric aci... | 10/17/1978 |
| 4115517 | Treatment of sulfur oxides with aqueous glyoxylic acid solutions Sulfuric acid or absorbed sulfur trioxide in aqueous glyoxylic acid solutions may be removed by contacting the aqueous glyoxylic acid solutions with a barium compound such as barium hydroxide which is substantially inert to the glyoxylic acid but which pr... | 09/19/1978 |
| 4113835 | Process for preparing pure synthetic calcium sulfate semihydrate A process for the purification of phosphate containing impure gypsum to obtain therefrom calcium sulfate semihydrate in a purified form by digesting the phosphate containing gypsum with nitric acid at a temperature between 22° and 100° C, the temperatur... | 09/12/1978 |
| 4110402 | Recovery of strontium from brine that contains strontium and calcium Strontium values are recovered from a brine that contains strontium and calcium salts by admixing, with the brine, strontium sulfate seed and a water soluble sulfate and recovering the strontium sulfate that is thereby produced. The soluble sulfate should... | 08/29/1978 |
| 4101635 | Method for regenerating and recycling catalyst for oxidation of sulfur dioxide In a method for oxidizing sulfur dioxide by contacting a sulfur dioxide-containing gas and an oxygen-containing gas with an aqueous solution containing pentavalent vanadium and divalent manganese as a catalyst, the method for regenerating and recycling th... | 07/18/1978 |
| 4100254 | Industrial process of preparing magnesia of high purity In an industrial process of preparing high-purity magnesia from an impure magnesium-containing starting material, wherein the starting material is dissolved in HCl and the resultant acidic solution is subjected to a multistep treatment for precipitating t... | 07/11/1978 |
| 4100260 | Regenerative method for quantitative removal of sulfur dioxide from stack gases Sulfur dioxide is removed from stack gases by absorption in an aqueous medium, the preferred embodiment containing a chemical oxidant which generates hydrogen peroxide on a demand that equals the rate sulfur dioxide is absorbed into the medium whereby the... | 07/11/1978 |
| 4096235 | Process of producing magnesia with sulfuric acid recycle This invention relates to a process of producing magnesia from magnesium-containing carbonate ores, which comprises leaching with sulfuric acid, subsequently neutralizing the solution with magnesia, separating the undissolved impurities, crystallizing mag... | 06/20/1978 |
| 4092402 | Method for removing sulfur dioxide from exhaust gas Scale is formed in a closed system wherein an exhaust gas containing sulfur dioxide is treated with an aqueous solution containing an organic acid alkali salt to remove the sulfur dioxide in the form of gypsum from the exhaust gas. The method disclosed he... | 05/30/1978 |
| 4086322 | Production of fluoride-free phosphates A method is disclosed for the acidulation of phosphate rock and the production of substantially pure alkali metal phosphates, calcium phosphates, and phosphoric acid which are essentially free of fluorides and recovery of the fluorine values from the star... | 04/25/1978 |
| 4082835 | Removal of SO2 from gases Sulfur dioxide is separated from an aqueous solution containing the same by subjecting the stream to electrodialytic water splitting. In particular a novel method for removing SO2 from dilute gas streams by means of alkaline solution scrubbing,... | 04/04/1978 |
| 4080428 | Process for the purification of flue and other waste gas The invention is concerned with improved process and apparatus for the removal of sulphur dioxide from flue gas or other waste gas of the kind in which the waste gas is scrubbed by a circulating wash liquid containing lime suspensions, i.e. suspensions of... | 03/21/1978 |
| 4080427 | Method of desulfurizing exhaust gases by wet lime-gypsum process A method of desulfurizing exhaust gases by a wet lime-gypsum process comprises the steps of neutralizing a suitable amount of liquid containing impurities separating the neutralized material into solid and liquid phases, heating the separated solid phase ... | 03/21/1978 |
| 4078978 | Purification of electrolysis brine for diaphragm cells In the electrolysis of an alkaline earth metal-containing alkali metal brine wherein the alkaline earth metals contained in the brine are removed, the brine is subjected to electrolysis, and the residual brine is concentrated and recycled for further elec... | 03/14/1978 |
| 4073864 | Method of desulfurizing exhaust emission using pulverized slag as absorbent A method of desulfurizing exhaust emissions which comprises pulverizing slag from a blast furnace, converter, open-hearth furnace or the like which is composed principally of Ca2 Al2 SiO7, suspending the resulting minute p... | 02/14/1978 |
| 4069300 | Process for producing -type calcium sulfate hemihydrate A process for producing -type hemihydrate calcium sulfate by oxidizing calcium sulfite with an oxidizing agent in a suspension containing at least one anionic, nonionic or amphoteric surface active agent.... | 01/17/1978 |
| 4066735 | Process for demineralization of crustacea shells This disclosure is concerned with the demineralization of crustacea shells and the like, before or after protein removal therefrom, with sulfurous acid, thus to convert the calcium carbonate of the shell to calcium bisulfite solution which may be separate... | 01/03/1978 |
| 4049866 | By-product gypsum fillers for mica-free joint compounds A filler for a mica-free joint compound, comprising by-product gypsum having a mean particle size between about 11 and about 12 microns, a percentage by weight of particles smaller than 1 micron of between about 5 and about 6.5, and a packed dry bulk volu... | 09/20/1977 |
| 4046856 | Method for removing sulfur oxide from stack gas In a method for removing sulfur oxides in a stack gas by absorbing the sulfur oxides in an absorbent comprising predominantly calcium compounds, thereby converting the sulfur oxides to sulfites, and then oxidizing the sulfites to gypsum, the improvement w... | 09/06/1977 |
| 4039616 | Process for the manufacture of stabilized, hardenable calcium sulphate by reacting crude phosphate with sulphuric acid Calcium sulphate produced by reacting crude phosphate with sulphuric acid is washed with aqueous solutions of condensed and complex aluminium fluorides of the general formulae MeAlF4, Me2 AlF5 and Me5 Al3 | 08/02/1977 |
| 4024220 | Flue gas scrubbing and conversion of calcium sulfite to calcium sulfate In the scrubbing of sulfur compound containing stack gases, there is an advantage to converting calcium sulfite to calcium sulfate downstream from the scrubber in order to provide for smaller sludge handling equipment and to form a more usable sludge. Thu... | 05/17/1977 |
| 4006215 | Recovering iron, nickel, or cobalt from sulfate solution Sulfate solutions containing at least one valuable metal from the group: Fe, Ni and Co, particularly solutions resulting from the leaching of lateritic ores or concentrates, are treated to recover the valuable metal. The latter is precipitated by treating... | 02/01/1977 |
| 3987149 | Method for removing sulfur dioxide from exhaust gas A sulfur dioxide-containing exhaust gas is scrubbed by contact with an aqueous solution containing an alkali salt of an organic acid to dissolve sulfur dioxide in the aqueous solution in the form of alkali sulfite. The alkali sulfite in the solution is co... | 10/19/1976 |
| 3985860 | Method for oxidation of SO2 scrubber sludge This process provides for the oxidation of calcium sulfite produced from wet scrubbing sulfur oxides to gypsum in an aqueous medium containing magnesium sulfate. The process renders scrubber sludge filterable for further manufacturing use or disposal with... | 10/12/1976 |
| 3980753 | Industrial process of preparing magnesia of high purity Magnesia of very high purity is produced industrially from a magnesite waste material wherein impurities are present in such amounts that the weight ratio of the precipitable hydroxide ions, calculated as the sum of Fe2 O3 + Al2... | 09/14/1976 |
| 3980756 | Air pollution control system Gases containing SO2 from a furnace are contacted in the scrubbing zone of a scrubber with an aqueous scrubbing medium containing solid alkaline earth metal carbonate, seed crystals of alkaline earth metal sulfate and dissolved alkaline earth m... | 09/14/1976 |
| 3972980 | Process removing sulfur dioxide from gases A sulfur dioxide containing gas stream is passed through a gas scrubber through which is circulated a scrubbing medium, preferably slurried, containing a reactant which reacts with the sulfur dioxide to produce sulfites and/or sulfates, a portion of which... | 08/03/1976 |
| 3965242 | Method for desulfurizing exhaust gas by alkali sulphite-gypsum process Process for through desulfurization of exhaust gas by treating the gas through the steps of absorption, double decomposition, oxidation, and alkali sulfate conversion.... | 06/22/1976 |
| 3961021 | Method for removing sulfur dioxide from combustion exhaust gas Sulfur dioxide can be removed from a combustion exhaust gas and converted to gypsum by first scrubbing a sulfur dioxide-containing combustion exhaust gas with an aqueous alkali sulfite solution to form an alkali bisulfite-containing aqueous solution and t... | 06/01/1976 |
| 3959441 | Desulfurization process Sulphur dioxide is removed from a stack gas by bringing said gas containing SO2 into contact with an absorbing solution prepared by adding an hydroxide of a metal from either Groups II, III and VIII of the periodic Table to an aqueous solution ... | 05/25/1976 |
| 3951675 | Method for the treatment of phosphogypsum The purification of the raw phosphogypsum issued from the fabrication of phosphoric acid by reaction between phosphate rock and sulphuric acid consists of removing the extreme grain size fractions therefrom. This method has been developed after it has been fou... | 04/20/1976 |
| 3949047 | Method of precipitating radium to yield high purity calcium sulfate from phosphate ores In the manufacture of phosphoric acid by treatment of phosphate ores with excess phosphoric acid and precipitation of calcium ions as calcium sulfate, the purity and quality of the byproduct calcium sulfate is substantially improved by subjecting the mono... | 04/06/1976 |
| 3947542 | Process for treatment of pyrochlore concentrates A continuous process for extraction of niobium, rare earths and thorium from niobium ore concentrates which includes digesting the ore with a hot solution containing 13 to 16 moles of sulphuric acid per liter, diluting the solution to a concentration of 1... | 03/30/1976 |
| 3944649 | Multistage process for removing sulfur dioxide from stack gases Method and apparatus for removing sulfur dioxide from stack gases. The stack gases are scrubbed with an aqueous wash liquid containing one or more alkali metal compounds which react to form the bisulfite, sulfite and sulfate salts of the alkali metal. The... | 03/16/1976 |
| 3943230 | Process for the removal of sulfur oxide from waste gas A process, in which sulfur dioxide gas contained in waste gas is removed therefrom and collected as gypsum. In said process, the waste gas is subjected to a flow of detergent solution of basic aluminium sulfate so that the sulfur dioxide is absorbed into ... | 03/09/1976 |
| 3939248 | Process and apparatus for manufacturing phosphoric acid A method and apparatus for manufacture of wet process phosphoric acid wherein phosphate rock and sulfuric acid are separately added to a combination reactor and cooler unit at a rate of addition such that the increase in calcium content and sulfate conten... | 02/17/1976 |
| 3935296 | Method for removing sulfur dioxide from a combustion exhaust gas A method for effectively removing sulfur dioxide in the form of calcium sulfite from a combustion exhaust gas, comprising the steps of (1) feeding a portion of the combustion exhaust gas to a dilute sulfuric acid solution to produce sulfurous acid in the ... | 01/27/1976 |
