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| Number | Title | Issue Date |
| 4826521 | Method of manufacturing articles of extremely pure synthetic particulate silicon dioxide In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processe... | 05/02/1989 |
| 4810415 | Process for manufacturing ultra pure silica and resulting encapsulated products High purity silica powder formed from a sol-gel process is made from a quantity of an industrial grade hydrolizable silicon organometallic substance mixed with a quantity of an industrial grade organic solvent miscible in said organometallic substance and... | 03/07/1989 |
| 4810674 | Porous glass monoliths In one embodiment this invention provides novel microporous inorganic oxide glass monolith structures, which have improved mechanical strength and optical transparency. An invention glass monolith is produced by a novel sol-gel process, which utilizes tri... | 03/07/1989 |
| 4808397 | Process for preparing fine particles of metal oxides A process for preparing spheroid particles of oxide compounds, having an average diameter of smaller than 3 microns. An emulsion is prepared of a hydrolyzable liquid oxide compound in a perfluoropolyether, the emulsion is reacted with water, water vapor o... | 02/28/1989 |
| 4806328 | Method of manufacturing monolithic glass members Monolithic glass members are prepared by first hydrolyzing a solution of tetraethoxysilane in alcohol with an acid medium, and then gelating in a basic medium while using acid and base mediums to form compounds that volatilize during drying and sintering ... | 02/21/1989 |
| 4797294 | Chillproofing with magnesium silicate/silica gel agents Combinations of silica gel and magnesium silicate have been found to be effective agents to prevent the formation of haze in beer. Said haze, often called chill haze, is prevented by contacting the ruh beer with the combination to remove some or all of th... | 01/10/1989 |
| 4788046 | Method for producing materials for co-sintering This invention relates to glass-ceramic packages for integrated circuits containing multi-layer, interconnected thick film wiring patterns obtained by co-sintering a glass-ceramic composite and copper, silver, palladium or gold based conductors at tempera... | 11/29/1988 |
| 4786618 | Sol-gel method for making ultra-low expansion glass Ultra-low thermal expansion TiO2 --SiO2 glasses are prepared using a sol-gel process wherein a stable alkali silicate solution comprising colloidal TiO2 and having a pH above 9 is gelled to form a semisolid silicate gel, t... | 11/22/1988 |
| 4778667 | Spheroidal silica This invention relates to novel silica spheroids and to their production by a phase separation technique in which an aqueous alkaline stabilized silica sol and an aqueous solution of a non-adsorbing polymer are mixed and acidified to produce the new silic... | 10/18/1988 |
| 4776867 | Process for molding optical components of silicate glass to a near net shape optical precision A silicate optical glass article is made by forming a gel from a hydrolyzed silicon alkoxide. The resulting gel is molded, cured, dried, solvents removed, heated to form a dense glass having near net shape dimensions thereby reducing expensive polishing s... | 10/11/1988 |
| 4775520 | 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... | 10/04/1988 |
| 4767429 | Glass body formed from a vapor-derived gel and process for producing same The disclosed simple, economical and rapid sol-gel process for forming a silica-based glass body, termed the "vapogel" process, comprises introduction of a silicon halide-containing gas (e.g., SiCl4 +O2) into an aqueous medium. The t... | 08/30/1988 |
| 4768081 | Process for encapsulating microelectronic circuits with organic components Special absorbers or getters are incorporated in hermetically sealed electronic circuits with organic components, for example, with parylene passivations, silver conductive adhesives, and sealing materials. The getter material, preferably BaAl4... | 08/30/1988 |
| 4765818 | Porous glass monoliths In one embodiment this invention provides a novel sol-gel process for the production of microporous inorganic oxide glass monolith structures which have improved mechanical strength and optical transparency. An essential feature of the process is the use ... | 08/23/1988 |
| 4764357 | Process for producing finely divided powdery metal oxide compositions A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effecti... | 08/16/1988 |
| 4752459 | Preparation of porous bodies A process for the preparation of at least one porous oxide or hydroxide body comprises: (i) adding at least one body comprising a sol of the oxide or hydroxide to a fluid freezing medium; and (ii) raising the temperature of the solid, quenched sol so that solv... | 06/21/1988 |
| 4752458 | Structured silicas A method of preparing spherical microparticles of silica comprising adding an acid solution to a silicate solution before or after addition of an alkali metal alginate, ammonium alginate, starch, gelatin, pectin or mixtures thereof. The microparticles can... | 06/21/1988 |
| 4720475 | Silica-particles containing alumina, process for preparing same and the use thereof Amorphous, substantially spherical silica particles obtained by acidic hydrolysis of substantially spherical synthetic crystalline calcium silicates having a size of from 20 to 120 microns are coated with a layer comprising silica and alumina. The silica ... | 01/19/1988 |
| 4707348 | Method for neutralizing waste sulfuric acid by adding a silicate It has been shown that magnesiumsilicates, particularly Mg-rich olivine, is very advantageous for neutralizing waste sulfuric acid. A silicagel and a Fe/Mg-containing liquid are formed. The experiments show that a distinct separation of the silicagel from... | 11/17/1987 |
| 4705771 | Process and catalyst for the production of formaldehyde from methane Formaldehyde is made from methane and a molecular oxygen containing gas by using a silica supported catalyst having less than 350 parts per million by weight of sodium and having a catalytically effective amount of MoO3. The low sodium form of ... | 11/10/1987 |
| 4696808 | Procedure to prepare transparent silica gels A process for the preparation of transparent silica gels which can be used as crystal growth media is disclosed. A quantity of cation exchange resin beads is placed in a solution of a soluble potassium salt and stirred for several hours to allow the potas... | 09/29/1987 |
| 4683128 | Process for manufacturing high purity silica This invention deals with a process for manufacturing high purity silica which comprises making an aqueous alkali silicate solution into fine fibrous gel in a coagulant, treating the fibrous gel obtained with an acid-containing solution, and then with wat... | 07/28/1987 |
| 4678652 | Process for producing silica in fine powder form A process for producing silica in fine powder form, which comprises (a) adding at least one water-miscible alcohol selected from water-miscible monohydric and dihydric alcohols to an aqueous solution of an alkali metal silicate having an SiO2 concen... | 07/07/1987 |
| 4676964 | Process for purifying silica This invention concerns a process for purifying silica produced from an alkali silicate aqueous solution, which usually contains more than 200 ppm of impurities, to silica containing less than 30 ppm of impurities. Concretely, the purification process of ... | 06/30/1987 |
| 4667417 | Preparation of aerogels A process for the drying of inorganic hydrogels obtained from readily hydrolyzable compounds of the elements Al, Si, Ti, B, La, Zr, Cr, Sn, Th or Mg, and organic hydrogels based on gelatine, albumin or agar agar, from CO2, to give aerogels is e... | 05/26/1987 |
| 4649037 | Spray-dried inorganic oxides from non-aqueous gels or solutions Inorganic metal oxides having high surface area and pore volume are prepared by spray drying. The admixture which is spray dried to yield the metal oxides is produced from reactants comprising at least one hydrolyzable metal compound, a sufficient amount ... | 03/10/1987 |
| 4640807 | Process for the preparation of silica spheres Silica spheres are prepared in a process comprising: (a) preparing a silica hydrosol by mixing an aqueous solution of an alkali metal silicate with an aqueous solution of an acid; (b) converting the hydrosol into droplet form; (c) aging the droplets in a fluid to p... | 02/03/1987 |
| 4621068 | Process for preparing polymer particles Substantially spherical solid particles of a substantially uniform particle size are prepared by dispersing a solution of a polymerizable substance in a first liquid by means of a suitble emulsifier to form droplets of the polymerizable substance of a sub... | 11/04/1986 |
| 4619908 | Non-aged inorganic oxide-containing aerogels and their preparation The invention is directed to inorganic oxide-containing aerogels and the method of preparing such oxide-containing aerogels which are characterized by high surface areas and high pore volume. The preparation comprises dissolving the inorganic alkoxide or ... | 10/28/1986 |
| 4612178 | Degradation of polycyclic aromatic hydrocarbons adsorbed over chrysotile asbestos The invention relates to a process for degrading polycyclic aromatic hydrocarbons adsorbed over chrysotile asbestos fibers which comprises oxidizing in the presence of moisture with ozone a mass of polycyclic aromatic hydrocarbons adsorbed on chrysotile a... | 09/16/1986 |
| 4610863 | Process for forming transparent aerogel insulating arrays An improved supercritical drying process for forming transparent silica aerogel arrays is described. The process is of the type utilizing the steps of hydrolyzing and condensing aloxides to form alcogels. A subsequent step removes the alcohol to form aero... | 09/09/1986 |
| 4595578 | Stabilized silica gel and process for making same There is provided an improved process for producing a silica gel having improved pore volume relative to conventional silica gels which comprises the steps of gelling an aqueous alkali metal silicate with an aqueous acid, washing the resulting gel to remo... | 06/17/1986 |
| 4576921 | Preparation of dispersions and ceramics from hydrated metal oxides The present invention relates to the preparation of materials and finds application in the preparation of dispersions and gels. The invention provides, in one aspect, a process for the preparation of a dispersion which comprises treating a chemical compound wi... | 03/18/1986 |
| 4554211 | Spherical micro-porous silica gel and a production process thereof A spherical micro-porous silica gel, which is characterized by having a mean diameter of 3-20 μm, a bulk density of 0.28-0.41 g/cm3, a pore size of 18,000-100,000 and a specific surface area of 1,000-1,400 m2 /g and a production pro... | 11/19/1985 |
| 4508607 | Particulate dialytic silica Finely divided particulate silica is prepared by the electrodialysis of sodium silicate solution in the presence of silica-containing nucleation particles (seeds). The novel particulate silica product, herein referred to as dialytic silica, may be used in... | 04/02/1985 |
| 4504595 | Fluorinated silica catalyst and preparation of aromatic/aliphatic nitriles in the presence thereof An improved fluorinated siliceous catalyst, well adapted for the catalytic synthesis of aromatic/aliphatic nitriles from their corresponding formamides, formanilides or amides, is comprised of a plurality of silica particulates, the specific surface of wh... | 03/12/1985 |
| 4432956 | Preparation of monolithic silica aerogels, the aerogels thus obtained and their use for the preparation of silica glass articles and of heat-insulating materials The invention relates to a process for the preparation of monolithic silica aerogels by drying silica gels under hypercritical conditions, which is characterized by the absence of washing of the silica gel, a high heating rate in the autoclave and purging... | 02/21/1984 |
| 4402927 | Silica aerogel Silica aerogel in the form of a substantially crack-free, preferably transparent block is described, together with a method for the preparation of such aerogel and use thereof in solar panels. The preparation is effected by means of hydrolysis of a tetraa... | 09/06/1983 |
| 4395388 | Synthetic cristobalite A method for preparing synthetic cristobalite comprises (1) preparing a mixture containing sources for an oxide of silicon and for an oxide of boron, a base of an alkali or alkaline earth metal or precursor of such base, a polyhydric alcohol, and water; a... | 07/26/1983 |
| 4389385 | Production of porous gels and ceramic materials The invention relates to gels produced by dispersing solid primary particles of an inorganic substance in a liquid to form a sol containing colloidal particles which are aggregates of the primary particles and drying the sol to produce a porous gel. The g... | 06/21/1983 |
