Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4031193 | Process for preparing calcium fluoride from hexafluoro silicic acid Disclosed is a process for the preparation of calcium fluoride comprising reacting hexafluoro silicic acid with calcium carbonate in the presence of sulfate or aluminum ions within a pH range of between about 2 and 6 and separating the calcium fluoride pr... | 06/21/1977 |
| 4029513 | Surface treated silica Microfine silicas that are useful as rubber reinforcing fillers and thickening agents, and are readily dispersible are prepared by modifying the surface layer of the silica. The surface modification results from including in or affixing to the surface of ... | 06/14/1977 |
| 4029514 | Method of precipitating microfine silica using phosphate The addition of sodium phosphate to a dilute solution of alkali metal silicate, precipitates microfine silica that is readily dispersible.... | 06/14/1977 |
| 4012452 | Olefin hydration process An improved olefin hydration process is disclosed and uses as the catalyst, phosphoric acid supported on a particular type of porous silica xerogel which has been treated with steam under particular temperature conditions.... | 03/15/1977 |
| 4011096 | Vesiculated silica microspheres Vesiculated silica microspheres having an average diameter from 0.5μ to 50μ, a maximum vesicle diameter less than 50μ and a volume of vesicles from 5 to 95% of the total volume of the microspheres, produced by acidifying an oil-in-water-in-oil emulsion... | 03/08/1977 |
| 4010242 | Uniform oxide microspheres and a process for their manufacture Oxide microspheres having a diameter in the 0.5 to 20 micron range are produced by forming a mixture of urea or melamine and formaldehyde in an aqueous sol containing colloidal oxide particles. Copolymerization of the organic constituents produces coacerv... | 03/01/1977 |
| 4008130 | Method for distilling a ternary azeotrope of fluorosilicic acid, hydrogen fluoride and water Fluorosilicic acid solutions, which normally undergo decomposition when distilled, thereby creating unwanted forms of SiO2, are rendered stable during distillation by providing in the fluorosilicic acid solution an amount of HF which is at leas... | 02/15/1977 |
| 4003981 | Process of making superfine amorphous high structure silicic acid Superfine amorphous, high structure silicic acid is made by subjecting the components in the precipitation reaction, that is, an acid or acidic substance and an alkali-metal silicate solution to a shearing force during the alkaline phase of the precipitat... | 01/18/1977 |
| 4001379 | Process of making superfine amorphous high structural silicic acid Superfine amorphous, high structure silicic acid is made by subjecting the components in the precipitation reaction, that is, an acid or acidic substance and an alkali-metal silicate solution to a shearing force during the alkaline phase of the precipitat... | 01/04/1977 |
| 3996338 | Silica xerogel An improved silica xerogel comprises a particular type of porous silica xerogel which has been treated with steam under particular temperature conditions.... | 12/07/1976 |
| 3989512 | Plasma heat treatment means and method A heater assembly comprising cathodic plasma generating means for generating a column of plasma, a plurality of anodic plasma torches the outlets of which are symmetrically disposed about the axis of the column and circuit means for energizing said genera... | 11/02/1976 |
| 3977893 | Amorphous precipitated siliceous pigments and improved process for producing such pigments A process for producing precipitated silicic acid pigments having new and improved properties is disclosed. The pigments are produced by the simultaneous introduction of a solution of an alkali metal silicate and an acid, such as sulfuric acid, into an aq... | 08/31/1976 |
| 3968197 | Process for treating sodium silico fluoride The invention relates to a process of the treatment of sodium silico fluoride. In the invention, sodium silico fluoride is decomposed with a relatively high concentration of an aqueous ammonium solution or an ammonia gas to produce a mixed aqueous slurry ... | 07/06/1976 |
| 3954944 | Fine silicas This invention discloses a new form of wet precipitated silica which is characterised in terms of energy required to breakdown particles and a defined thickening effect. A multistage precipitation and flocculation production process is also disclosed in w... | 05/04/1976 |
| 3951863 | Silica xerogel production A method of converting a hydrogel to a xerogel by passing a hydrogel and an organic liquid in which water is soluble in countercurrent contact to remove the water from the hydrogel. The solution of organic liquid and water which is formed is allowed to se... | 04/20/1976 |
| 3936276 | Process for producing amethyst crystal A process for producing amethyst crystals which involves growing colourless quartz crystals by a hydrothermal method of a temperature drop in a high-pressure autoclave on crystalline quartz seed plates oriented parallel to pinacoid crystallographic planes... | 02/03/1976 |
| 3936388 | Process for the production of silicon dioxide ion exchangers An improved process for the production of silicon dioxide ion exchangers, which comprises the step of reacting silicon dioxide with benzyltrichlorosilane, in the absence of solvent and air, followed by hydrolysis, to produce a benzylated silicon dioxide w... | 02/03/1976 |
| 3935299 | Process for preparation of wide-pore adsorbent for use in chromatography A process for preparing a wide-pore adsorbent adapted for use in chromatography, comprising mixing fine disperse non-porous silica having a specific surface area S of 35 to 380 m2 /g with water followed by drying the aqueous suspension at a tem... | 01/27/1976 |
