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| Number | Title | Issue Date |
| 5231059 | Process for preparing black glass using cyclosiloxane precursors A process for preparing an oxidation resistant black glass having the empirical formula SiCx Oy, wherein 0 | 07/27/1993 |
| 5229096 | Silica gel The subject invention is a new type of silica gel and process for producing the same. The silica gel is the product of gelling alkali metal silicate with excess acid in aqueous medium containing a minute amount a polymerization modifier. The modifier and ... | 07/20/1993 |
| 5227239 | Production of hollow aerogel microspheres A method is described for making hollow aerogel microspheres of 800-1200 μ diameter and 100-300 μ wall thickness by forming hollow alcogel microspheres during the sol/gel process in a catalytic atmosphere and capturing them on a foam surface containing ... | 07/13/1993 |
| 5215733 | Manufacture of silica gels using shear to reduce the particle size prior to washing with a hydrocyclone Amorphous silica prepared by the gel route requires washing to remove electrolyte. The gel is formed into small particles by shearing and then washed while being transported by water through stages which separate larger size material. The washing is more ... | 06/01/1993 |
| 5207943 | Oxygen absorber for low moisture products An oxygen-absorbing composition for absorbing oxygen from an enclosure, such as a package, containing a low-moisture product having an equilibrium relative humidity, or water activity, of between 30% and 90% including in relatively sufficient proportions ... | 05/04/1993 |
| 5206189 | Sol-gel method for the preparation of monolithic multicomponent oxide glasses An improved method for the production of a monolithic multicomponent oxide glass is achieved by forming an oxide host gel by a sol-gel process, placing the host gel in an aqueous solution of a salt of at least one metal selected from the group consisting ... | 04/27/1993 |
| 5196177 | Production of stable aqueous silica sol A sol of flat silica particles (100-1000 nm in size) is produced by the following steps (a) to (d) from an acidic aqueous sol (S0) of negatively charged silica particles (7-30 nm in diameter) and an aqueous solution (B) of basic aluminum or zir... | 03/23/1993 |
| 5169809 | SiO2 - and ZrO2 -based ceramic fibers and process for the preparation thereof The present invention relates to ZrO2 - and SiO2 -based ceramic fibers in which the weight ratio between SiO2 and ZrO2 is comprised between 99 and 0.7. The tetragonal ZrO2 phase is stable at temperatu... | 12/08/1992 |
| 5158758 | Production of silica having high specific surface area A method for production of high specific surface area silica gel by hydrolysis of silicon tetrahalide, wherein a solution of silicon tetrahalide in a non-reactive solvent such as alcohol is mixed with water to produce silica gel having a high surface area... | 10/27/1992 |
| 5156895 | Monolithic aerogel insulation cast and dried within a support structure and method A body 20 includes a support structure 30 in which is formed monolithic aerogel 32 and has terminal insulating properties or other desirable properties. The body 20 can be enveloped in an impermeable membrane 34, 36 so as to allow a vacuum or another envi... | 10/20/1992 |
| 5154905 | Method for producing unsintered cristobalite particles A method for producing a nonsintered cristobalite particles comprising heating amorphous silica particles at a temperature of 1400° to 1700° C. in the presence of cristobalite particles (hereinafter referred to as cristobalite particles for addition and... | 10/13/1992 |
| 5130110 | Process for obtaining refractory metal oxides based on silica by sol-gel route in aqueous medium Process for obtaining by sol-gel route refractory metal oxides based on silica in which a monolithic gel is prepared, in an aqueous medium, at a temperature of less than 60° C., by leaving at rest an aqueous sol obtained by simple mixing in stoichiometri... | 07/14/1992 |
| 5122291 | Thermal insulating material based on pigment containing silica aerogels A thermal insulating material based on a pigment-containing silica aerogel is obtainable by a) reacting an aqueous dispersion of sodium silicate and a pigment with a strong acid or sodium silicate with a pigment-containing strong acid to give a pigment-co... | 06/16/1992 |
| 5076980 | Method of making sol-gel monoliths A method of making a sol-gel monolith, comprising the steps of: (a) hydrolyzing and polycondensing one or more oxide precursors to form a sol comprising a plurality of oxide particles suspended in a liquid; (b) casting said sol into a mold; (c) gelling said sol by ... | 12/31/1991 |
| 5063179 | Process for making non-porous micron-sized high purity silica A process for making non-porous, dense, silica partices having a diameter of about 3 to 1000 microns, a nitrogen B.E.T. surface area less than about 1 m2 /g, a total impurity content of less than about 50 ppm and a metal impurity content conten... | 11/05/1991 |
| 5028407 | Method of production of high purity fusible silica A method of producing a high purity silica powder which can be fused to form transparent, bubble-free particles. An ammonium fluosilicate solution is purified preliminarily by removing colloidal-sized silica onto which impurities in the solution have been... | 07/02/1991 |
| 5028360 | Method of manufacturing spherical silica particles A method of manufacturing spherical silica particles comprising the steps of processing in an acid-containing solution and then washing with water the coagulant derived from an aqueous alkali metal silicate solution extruded through pores in a water-misci... | 07/02/1991 |
| 5019146 | Method for producing glass A method for producing a uniform glass of a large size without forming bubbles and holes at the bottom thereof is provided. This method comprises concentrating a sol solution obtained by hydrolysis of a metal alkoxide such as alkoxide of silicon in the pr... | 05/28/1991 |
| 5017354 | Process for production of high purity silica gel High purity, particulate silica gel is formed by the hydrolysis and condensation of a silicon alkoxide in a non-metal lined tumble dryer. The silica gel is then dried in the tumble dryer, is washed with an aqueous solution to remove trace contaminants, an... | 05/21/1991 |
| 5011669 | Process for producing a rod-form silica A process for producing a rod-form silica from a silicic acid ester according to a sol-gel process, which silica has a rod-form having a high aspect ratio and is advantageously used as a filler for resin sealants for semiconductors, is provided, which pro... | 04/30/1991 |
| 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 |
| 4975405 | Hydrated silica gel for stabilization treatment of beer There is provided by this invention a finely divided hydrated silica gel which has a specific surface area of 530 -720 m2 /g, preferably 550-650 m2 /g, a pore volume of 0.9-1.5 ml/g, preferably 1.0-1.4 ml/g, a mean pore diameter of 5... | 12/04/1990 |
| 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 |
| 4954327 | Production of silica aerogels Silica aerogels which exhibit very little shrinkage or partial growth during processing and drying are produced by foaming and reacting a mixture of an oxidated silicon compound, a salt forming compound and a gas in an aqueous medium. The foamed silica ge... | 09/04/1990 |
| 4943425 | Method of making high purity dense silica of large particle size A method of making high purity, dense silica of large particles size is described. Tetraethylorthosilicate is mixed with ethanol and is added to a dilute acid solution having a pH of about 2.25. The resulting solution is digested for about 5 hours, then 2... | 07/24/1990 |
| 4915923 | Filler for ink jet recording paper Disclosed is a filler for ink jet recording paper, said filler being composed of amorphous silica having a median diameter, measured by the coulter counter method, of 2 to 15 μm, an oil absorption of at least 180 ml/100 g, a refractive index, measured by... | 04/10/1990 |
| 4913966 | Porous structures This invention discloses novel, porous silica structures prepared from silica platelets. The structures are preferably prepared by spray-drying.... | 04/03/1990 |
| 4911903 | Spherical SIO2 particles Highly monodispersed nonporous spherical SiO2 particles are prepared having mean particle diameters between 0.05 and 10 μm with a standard deviation of not more than 5% and a method for the preparation of such particles. The particles can be p... | 03/27/1990 |
| 4906446 | Filler for dental materials and dental materials containing the same Silica gels of a mean grain size of about 0.5 to 50 μm are subjected to a heat or acid treatment that considerably reduces their surface area and the volume of pores smaller than 50 nm, while maintaining approximately the same grain size distribution and... | 03/06/1990 |
| 4900529 | Process for making crystalline siliceous materials ZSM-5 crystallites are produced with very low levels of blocking tetrapropyl ammonium ions (Q). The reaction mixture contains sources of silica, soda, alumina and trace amounts of Q ions as nucleation agents. Because the crystallites as synthesized from t... | 02/13/1990 |
| 4894357 | Process for adjusting the structural and/or surface character of oxides A process for adjusting at least one of the structural and surface characteristics of an oxide material, e.g. SiO2 or Al2 O3, by dehydration of a water-containing oxide gel under supercritical conditions by extracting the ... | 01/16/1990 |
| 4888309 | Hydrophobic, highly porous, three-dimensional inorganic structures Three dimensional hydrophobic substantially inorganic porous structure comprises a myriad of cavities interconnected by holes in which the diameters of the cavities are in the range of from 0.5 to 100 μm and the diameters of the holes are in the range of... | 12/19/1989 |
| 4872895 | Method for fabricating articles which include high silica glass bodies A method for forming articles which include silica-containing glass bodies, as well as the resulting articles, are disclosed. In accordance with the method, silica-containing gel particles are fused to form a glass body. In contrast to previous such metho... | 10/10/1989 |
| 4865829 | Method for preparing silica gel particles A method for preparing silica gel particles, which comprises suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution, followed by gelation wherein said organic liquid contains an ethyl cellulos... | 09/12/1989 |
| 4857290 | Process for producing silica of high purity This invention provides a process for producing silica from silica sol which comprises preparing an acidic silica sol applied with a hydrogen peroxide treatment from an aqueous solution of alkali silicate, purifying the acidic silica sol by using a cation... | 08/15/1989 |
| 4851023 | Method for manufacturing aluminosilicate optical glass Aluminosilicate optical glass without boron oxide, comprising 60-95 mols % silica and at least 2 mols alumina, the remainder being made up of at least one oxide of a metal selected from silver and thallium. The glass may also contain caesium. Optical wave... | 07/25/1989 |
| 4849378 | Ultraporous gel monoliths having predetermined pore sizes and their production A method of fabricating an ultraporous SiO2 containing gel monoliths having a predetermined mean pore size with narrow distribution of the size of the pores around the mean. A SiO2 containing sol is prepared while simultaneously cont... | 07/18/1989 |
| 4847235 | Silica product An ammonia aged silica which can be used for example, in an improved process for chillproofing a malt beverage. The silica is aged with ammonia for a prolonged period of time. Better stability with smaller amounts of silica are obtained.... | 07/11/1989 |
| 4842837 | Process for producing fine spherical silica A process for producing fine spherical silica, comprising a step of hydrolyzing an alkoxysilane in a mixed solution comprising water and alcohol and containing an alkaline catalyst, wherein the amount of said alkaline catalyst is 0.5 to 10 in molar ratio ... | 06/27/1989 |
| 4840653 | Fabrication of high-silica glass article Incorporation of fluorine into a porous silica body, such as an unsintered body produced by a sol-gel method, by VAD or OVPO, reduces or eliminates bubble or pore formation upon re-heating of the glass formed by sintering of the porous material. Effective... | 06/20/1989 |
