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| Number | Title | Issue Date |
| 5023065 | Synthetic mica powder, manufacturing method thereof and cosmetics having the synthetic mica powder blended therein The present invention concerns synthetic mica powder containing from 75 to 99% of the stoichiometrical composition of fluorine and/or having a shape in which the end face of particle is laminated, process for producing such synthetic mica powder, as well ... | 06/11/1991 |
| 5021230 | Method of making silicon carbide A process for production of high purity, sub-micron size, silicon carbide by reacting a mixture of silica powder and carbon powder in a mixing reactor. The reactor, initially pressurized with a non-reactive gas, is indirectly heated and when the charge re... | 06/04/1991 |
| 5009869 | Methods for purification of air Air contaminated with chemical and biological pollutants is purified by treating chemically and electrochemically in a closed system minimizing the generation of by-products for disposal. Pollutants are treated in a scrubber zone with a scrubber liquid-el... | 04/23/1991 |
| 5008090 | Catalytic process for minimizing the H2 S emissions from automotive exhaust This invention relates to a catalyst comprising a mixture of a primary refractory inorganic oxide having dispersed thereon at least one first active component selected from the group consisting of rare earth oxides and a secondary support consisting of zi... | 04/16/1991 |
| 5004588 | Process for removal of hydrogen sulfide from gaseous stream This invention provides a process for removing H2 S from the gaseous stream by contacting the stream with an aqueous solution of a water soluble oxidized polyvalent metal chelate catalyst in the presence of oxygen whereby the metal chelate cata... | 04/02/1991 |
| 5000933 | Process for hydrothermal production of sodium silicate solutions The direct hydrothermal production of high purity sodium silicate solutions having a high SiO2 : Na2 O molar ratio by reaction of a silicon dioxide source with aqueous sodium hydroxide solutions, or with aqueous sodium silicate solut... | 03/19/1991 |
| 4997630 | Removal of CO2 and/or H2 S from gases Gases containing CO2 and/or H2 S in a first absorption stage, at from 40° to 100° C., with an aqueous absorption liquid containing from 20 to 79% by weight of methyldiethanolamine, the gas obtained at the top of the first absorptio... | 03/05/1991 |
| 4994107 | Aerosol reactor production of uniform submicron powders A method of producing submicron nonagglomerated particles in a single stage reactor includes introducing a reactant or mixture of reactants at one end while varying the temperature along the reactor to initiate reactions at a low rate. As homogeneously sm... | 02/19/1991 |
| 4992249 | Reduction of nitrogen- and carbon-based pollutants through the use of urea solutions Disclosed is a process for reducing nitrogen oxides in an effluent from the combustion of a carbonaceous fuel under oxygen-rich conditions which minimize the production of carbon-based pollutants. A dispersion of a dilute aqueous urea solution is injected... | 02/12/1991 |
| 4992251 | Silicas Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m2 /g, a weight mean particle size of 5 to 20 micron... | 02/12/1991 |
| 4990318 | Selective removal of hydrogen sulfide over a nickel-promoted absorbing composition Hydrogen sulfide is removed from a fluid stream containing hydrogen sulfide and less than 500 ppm of free hydrogen by contacting the fluid stream under suitable absorbing conditions with an absorbing composition consisting essentially of a base material a... | 02/05/1991 |
| 4986971 | Method for production of trichloromonosilane The present application relates to a method for production of trichloromonosilane in a fluidized bed reactor by reaction of silicon powder and HCl at a temperature between 280° and 300° C. wherein silicon powder which has been produced by gas atomizatio... | 01/22/1991 |
| 4986972 | Method for making silicon nitride powder A mixture of silica powder and carbon powder is heated in a mixture of NH3 gas and Cm Hn gas. Only silica powder may be heated in a mixture of NH3 gas and Cm Hn gas.... | 01/22/1991 |
| 4985224 | Process for making silicon nitride whisker Silica powder or a mixture of silica powder and silicon nitride whisker is heated at a temperature ranging from 800° C. to 1,700° C. in a gas mixture of ammonia gas (NH3) and hydrocarbon gas (Cm Hn) so as to produce sili... | 01/15/1991 |
| 4983369 | Process for forming highly uniform silica spheres A process for producing highly uniform microspheres of silica having an average diameter of 0.1-10 μm from the hydrolysis of a silica precursor, such as tetraalkoxysilanes, which is characterized by employing precursor solutions and feed rates which init... | 01/08/1991 |
| 4983370 | Purified quartz and process for purifying quartz Quartz is purified by removing mineral impurities, particularly alkali metal impurities, from within the quartz crystal lattice structure. According to the disclosed process, quartz crystals are subjected to a pretreatment that removes surface bound impur... | 01/08/1991 |
| 4983371 | Silicon nitride powder of low oxygen content Si3 N4 powder wherein the total oxygen content of the powder is 0.4% by weight or less is produced by preparing an amorphous Si3 N4 intermediate by reacting a Si-containing compound with an N-containing compound... | 01/08/1991 |
| 4983368 | Method of producing ଲ-sialon fine powder A method of producing a ଲ-sialon fine powder which comprises using a silane compound represented by the general formula of SiHx Cl4-x (0ࣘxࣘ4) as a Si source, aluminum chloride as an Al source and an ether represented by the... | 01/08/1991 |
| 4981665 | Hexagonal silicon carbide platelets and preforms and methods for making and using same Crystalline silicon carbide wherein at least 90 weight percent of the silicon carbide is formed from a plurality of hexagonal crystal lattices wherein at least 80 weight percent of the crystals formed from the lattices contain at least a portion of opposi... | 01/01/1991 |
| 4981672 | Composite coating for electrochemical electrode and method The present invention provides a coating for electrodes for use in electrochemical cells having an electrochemically active species and an electrolyte. The coating contains active species material and is selectively permeable allowing for the diffusion of... | 01/01/1991 |
| 4981664 | Method of production of high purity silica and ammonium fluoride A method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas wherein silicon tetrafluoride-containing gas from the acidulation of phosphorus-containing rock is recovered and the liquid entrainment is separated ... | 01/01/1991 |
| 4980143 | Process for increasing the percentage of silicon tetrachloride A process is described for increasing the percentage of silicon tetrachloride during the reaction of hydrogen chloride or a mixture of hydrogen chloride and chlorine with substances containing metallic silicon. In this process the chlorosilanes are expose... | 12/25/1990 |
| 4978516 | Process for treating talc A process for improving a purity and/or whiteness degree of a talc powder is disclosed. A talc powder with a particle size of about 0.8 mm or less containing impurities such as asbestos, etc. is treated with a phosphoric acid agent under heating at from 7... | 12/18/1990 |
| 4976933 | Hydrogen stream purification Silane can be adsorbed by KOH on alumina. This discovery can be used to remove silane from other gases, e.g. hydrogen.... | 12/11/1990 |
| 4976944 | Purification of silane gas Impure gaseous silane containing such impurities as, in particular, phosphines and arsines, is purified, whether by chemisorption and/or physical adsorption, by contacting such silane gas with a sorption mass that includes cooper values, e.g., a copper ca... | 12/11/1990 |
| 4976943 | Spherical, hydrophilic silica, method of its preparation and use A spherical, hydrophilic silica consisting of compact, massive, non-crystalline particles without inner pores with a particle size of 0.5 to 10 μm, preferably 0.5 to 4 μm and especially 1 to 3 μm with a BET surface of | 12/11/1990 |
| 4976935 | Regeneration of solvent in H2 S removal from gases A process of removing hydrogen sulfide from a gas stream in which the hydrogen sulfide is dissolved in an absorption zone by a solvent having a good solvent power for hydrogen sulfide and a much greater solvent power for sulfur dioxide. The resultant solu... | 12/11/1990 |
| 4973463 | Carbon black for tire tread The present invention discloses carbon black for a tire tread having a cetyltrimethyl ammonium bromide specific surface area (CTAB) of 120 to 160 m2 /g, a dibutyl phthalate absorption number of compressed sample (24M4) of 95 to 135 ml/100 g, an... | 11/27/1990 |
| 4973462 | Process for producing high purity silica This invention concerns a process for producing high purity silica with less than 5 ppm of impurities from cheap alkali silicate aqueous solution (water glass) for industrial use, which commonly contains more than 2000 ppm of impurities, by directly addin... | 11/27/1990 |
| 4971779 | Process for the pyrolytic conversion of a polymeric precursor composition to boron nitride The disclosure is directed to polymeric B-aminoborazene compounds suitable for pyrolytic conversion to boron nitride. The B-aminoborazene compounds are preferably mixed with an organic solvent and a cross-linking agent to form a polymeric gel. The polymer... | 11/20/1990 |
| 4970057 | Silicon nitride vacuum furnace process An improved process of preparing silicon nitride by the direct nitridation of silicon metal is disclosed. The process is a multi-step one which is substantially more efficient than prior processes and produces a silicon nitride having an oxygen content of... | 11/13/1990 |
| 4968500 | Continuous method for preparation of granulated sodium perborate The spray drying of a solution containing hydrogen peroxide and sodium metaborate to obtain primary particles which are immediately conveyed after leaving the drying zone to a granulating device and are then granulated in the presence of free and/or perbo... | 11/06/1990 |
| 4965058 | Polysiloxazanes, silicon oxynitride fibers and processes for producing same Novel polysiloxazanes comprising --SiH2)n NH-- and --SiH2)m O-- as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with a Lewis base, with ... | 10/23/1990 |
| 4961911 | Process for reducing carbon monoxide emissions from a fluidized bed titanium dioxide chlorinator A process for reducing the amount of carbon monoxide emitted from a fluidized bed reactor for chlorinating titanium bearing material containing iron oxide comprising (a) feeding coke, titanium bearing material containing iron oxide, and chlorine to the re... | 10/09/1990 |
| 4960575 | Removal of hydrogen sulfide with on site generated sulfite from geothermal steam Geothermal steam is condensed with a sulfite solution to abate hydrogen sulfide. A portion of the hydrogen sulfide is converted in the condensation in the presence of soluble cationic polymeric catalysts to soluble sulfur compounds while avoiding elementa... | 10/02/1990 |
| 4960576 | H2 S abatement in geothermal steam during stacking operations A process for abating hydrogen sulfide during geothermal steam stacking operations is disclosed. The geothermal steam to be stacked is introduced into a geothermal steam stacking line. Ferric chelating solution is injected into the stacking line in an amo... | 10/02/1990 |
| 4959200 | Process for manufacturing silane There is here provided a method for manufacturing silane by subjecting a raw material, trialkoxysilane, to a disproportionation reaction in the gaseous phase in the presence of a catalyst which is an oxide of a metal in the third period of the periodic ta... | 09/25/1990 |
| 4957715 | Gas treatment process A process for the removal of carbon dioxide, hydrogen sulfide and alkyl mercaptans from a hydrocarbon-containing feed gas: (a) contacting the feed gas with an adsorbent capable of removing hydrogen sulfide and alkyl mercaptans from the feed gas at effective co... | 09/18/1990 |
| 4956162 | Process for removal of particulates and SO2 from combustion gases This invention pertains to methods for removal of pollution from the exhaust gas stream of combustion sources. More particularly, the invention relates to an improved method of elimination of particulate matte, sulfur dioxide (SO2) and volatile... | 09/11/1990 |
| 4956167 | Silicas An amorphous silica, especially precipitated silica, suitable for use in toothpastes, has a high abrasivity represented by a perspex abrasion value in the range from about 23 to about 35.... | 09/11/1990 |
