Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 5422319 | Fiber reinforced ceramic matrix composites exhibiting improved high-temperature strength Novel oxide coatings which can be conveniently applied to reinforcing fibers such as silicon carbide fibers, and which when introduced as a fiber coating into fiber reinforced ceramic matrix composites provide composites exhibiting improved resistance to ... | 06/06/1995 |
| 5164341 | Fiber reinforced ceramic matrix composites exhibiting improved high-temperature strength Fiber-reinforced ceramic matrix composite products comprising boron-nitride-coated reinforcing silicon carbide fibers disposed in a substantially non-porous alkaline earth aluminosilicate glass-ceramic matrix are disclosed, the matrix comprising triclinic... | 11/17/1992 |
| 5032555 | Process for making zirconia-alumina Zirconia toughened alumina (ZTA) is produced from precursor salts. The precursor salts are coprecipitated from solution to yield a gel in a liquid phase. The gel in excess of the critical temperature and pressure is dried at a temperature and pressure in ... | 07/16/1991 |
| 4957779 | Method for producing a protective layer on a ceramic body The present invention relates to a method for producing a protective layer on a ceramic or a ceramic composite body. Stated more particularly, by subjecting a ceramic or a ceramic composite body being interconnected residual metal therein to a particular ... | 09/18/1990 |
| 4948764 | Production of ceramic and ceramic-metal composite articles with surface coatings The invention comprises a method of making self-supporting ceramic and ceramic composite structures by the oxidation reaction of a body of molten parent metal precursor with a vapor-phase oxidant to form an oxidation reaction product. This reaction or gro... | 08/14/1990 |
| 4943541 | Glass ceramics Glass ceramics used as dental material, artifical bone, etc. which contain 0.01 to 25 parts by weight of alkali metal oxides (R2 O), such as Li2 O, Na2 O, K2 O, Rb2 O, and Cs2 O, in 100 par... | 07/24/1990 |
| 4937211 | High strength nitride bonded silicon carbide refractories An improved silicon nitride bonded silicon carbide refractory is disclosed. The improvement results from coating the silicon carbide grains with, or introducing into the bond during the mix preparation step, zirconium orthosulfate. The resulting product h... | 06/26/1990 |
| 4935055 | Method of making metal matrix composite with the use of a barrier A net shaped ceramic-reinforced aluminum matrix composite is produced by forming a permeable mass of ceramic material with a defined surface boundary having a barrier, and contacting a molten aluminum-magnesium alloy with the permeable mass of ceramic mat... | 06/19/1990 |
| 4927793 | Proton conductive material and method of manufacturing thereof Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula: Nax Aly Ti3+... | 05/22/1990 |
| 4925816 | Novel solid solution, heat-resistant sintered body and method of producing the same A novel solid solution has a composition of Ry Zr4 Six P6-x O24 (R is at least one forming bivalent or trivalent element 0ࣘxࣘ2, 2/3ࣘyࣘ2). Furthermore, a heat-resistant sintered body and heat-r... | 05/15/1990 |
| 4923832 | Method of making shaped ceramic composites with the use of a barrier In the present invention, there is provided a method for producing a self-supporting ceramic or ceramic composite body by the oxidation of a parent metal to form a polycrystalline ceramic material comprising the oxidation reaction product of said parent m... | 05/08/1990 |
| 4921818 | Method of making ceramic composites The invention relates to a method for producing ceramic composites obtained by oxidation of a parent metal to form a polycrystalline ceramic material by providing a filler having a coating of a silicon source on at least a portion of the filler different ... | 05/01/1990 |
| 4921821 | Lightweight oil and gas well proppants and methods for making and using same A lightweight oil and gas well proppant made by simultaneously mixing and compacting a milled calcined kaolin clay powder to form green pellets and then drying, screening and sintering the pellets to form proppant pellets having a specific gravity of 3.0 ... | 05/01/1990 |
| 4920838 | Method of cutting with ceramic cutting tool having improved toughness behavior This invention relates to a cutting tool material with improved toughness behavior. The improved toughness behavior is obtained by using carefully selected reinforcing materials. The objectives of this invention are realized by simultaneously utilizing ad... | 05/01/1990 |
| 4921820 | Lightweight proppant for oil and gas wells and methods for making and using same A lightweight oil and gas well proppant made by simultaneously mixing and compacting a mixture of kaolin clay which has been calcined at a temperature low enough to prevent the formation of mullite and crystobalites to an LOI of 12 or less when tested at ... | 05/01/1990 |
| 4921703 | Vermin exterminating element and vermin exterminating method using it A vermin exterminating element comprising a culture carrier having culture medium components containing vermin infectious microorganisms and/or the spores of the vermin infectious microorganisms cultivated therein, and a vermin exterminating method using ... | 05/01/1990 |
| 4919689 | Self-reinforced silicon nitride ceramic of high fracture toughness A process for preparing a self-reinforced silicon nitride ceramic body of high fracture toughness comprising hot-pressing a powder mixture containing silicon nitride, magnesium oxide, yttrium oxide and calcium oxide under conditions such that densificatio... | 04/24/1990 |
| 4918035 | Process for the preparation of complex perovskite type compounds The present invention provides a process for producing powder of complex perovskite type compounds by using metal alkoxides. In the prior art, methods were known for synthesizing crystalline powder of simple perovskite type compounds such as BaTiO3. | 04/17/1990 |
| 4916092 | Ceramic composites reinforced with modified silicon carbide whiskers Silicon carbide whisker-reinforced ceramic composites are fabricated in a highly reproducible manner by beneficating the surfaces of the silicon carbide whiskers prior to their usage in the ceramic composites. The silicon carbide whiskers which contain co... | 04/10/1990 |
| 4916113 | Methods of making composite ceramic articles A method of making self-supporting ceramic composite structures having filler embedded therein includes infiltrating a permeable mass of filler with polycrystalline material comprising an oxidation reaction product obtained by oxidation of a parent metal ... | 04/10/1990 |
| 4913518 | Fluoroborosilicate glass clad article and night vision device There are disclosed fluoroborosilicate glasses that are particularly adapted to being drawn with lead silicate core glasses to produce clad glass fibers useful in forming fiber optic bundles to be incorporated in night vision equipment. The cladding glass... | 04/03/1990 |
| 4913408 | Refractory liner compositions A refractory liner composition which consists essentially of carbon and a composite selected from the group consisting of zirconia and O'-sialon and zirconia and silicon oxynitride.... | 04/03/1990 |
| 4909849 | Method and mixture for solidifying and immobilizing various hazardous waste contaminants in an organic matrix A method of containing a liquid or semi-liquid hazardous waste found in an organic matrix, wherein the liquid or semi-liquid hazardous waste is mixed with combinations of calcium chloride, calcium formate, glycerine, pentaerythritol, 1,2-propanediol and p... | 03/20/1990 |
| 4908338 | Dried emulsion ceramic process Dried emulsion of precursors for ceramic additives are added to paints containing fine particle ceramic materials for use in ceramic capacitors. The precursors are converted into the desired additives in the paints during the sintering of the capacitor bo... | 03/13/1990 |
| 4906297 | Silicate-bonded silica materials A cementitious composition is produced from a curable mixture of particulate or comminuted silica, an alkali metal silicate, and an alkyl silicate. The preferred composition includes 80 to 95 weight percent silica, 5 to 20 weight percent sodium or potassi... | 03/06/1990 |
| 4906406 | Thermistor composition The invention is directed to a thick film thermistor composition consisting of finely divided particles of (a) a ruthenium-based pyrochlore, and (b) a short borosilicate glass or glass mixture, both dispersed in (c) an organic medium.... | 03/06/1990 |
| 4904623 | Molded metal carbide-boride refractory products Boron carbide/transition metal boride molded articles produced by hot preng a mixture of from 25 to 75% by weight of boron carbide, from 14 to 40% by weight or boron, from 10 to 50% by weight of tungsten and/or titanium carbide, from 0 to 6% by weight of... | 02/27/1990 |
| 4902652 | Method for production of a sintered article of diamond A sintered article of diamond is obtained by coating the surface of diamond particles with 30 to 0.1% by volume, based on the total volume of the diamond particles and aids, of at least one member selected from the group consisting of the transition metal... | 02/20/1990 |
| 4900697 | Glass powders for dental glass ionomer cements A fluoroaluminosilicate glass powder for dental glass ionomer cements has a specific gravity of 2.4 to 3.5 and a mean particle size of 0.02 to 10 μm, contains in its components 20 to 50% by weight of SiO2, 20 to 40% by weight of Al2... | 02/13/1990 |
| 4898844 | Process for manufacturing a ceramic body having multiple barium-titanate phases A ceramic includes a dielectric ceramic body that is made by mixing powders of two barium titanate compositions of widely disparate Curie temperature with a minor quantity of a borate flux and a sintering-inhibitor such as titania or bismuth oxide. A body... | 02/06/1990 |
| 4898842 | Organometallic-derived cordierite and other compounds comprising oxides of silicon The present invention provides a method of synthesizing amorphous cordierite-forming glasses from organometallic precursors. Either the sol-gel/ଲ-diketonate technique or the amorphous chelating hydroxycarboxylate process can be used advantageously. ... | 02/06/1990 |
| 4897370 | Process for preparing ceramics composite sintered bodies A process for preparing a glass or glass-ceramic composite sintered body by a sol-gel method comprises reacting (A) at least one silicic acid ester represented by the general formula (I). ##STR1## wherein R1 to R4 are each hydrogen ... | 01/30/1990 |
| 4897372 | High thermal conductivity ceramic body A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon A4F5F6F4 but excluding line F6F4 of FIG. 4, a porosity of less than about 10% by volume, and a thermal conductivity greater than 0.90 W/cm.K a... | 01/30/1990 |
| 4897219 | Voltage-dependent non-linear resistance ceramic composition It is a voltage-dependent non-linear resistance ceramic composition comprising SrTiO3 as host material, Dy2 O3 or Dy2 O3 and Nb2 O5 or Ta2 O5 or Ta2 O... | 01/30/1990 |
| 4897371 | Glass article protected from coloring by electron rays and method of using The instant invention relates to soda-lime-silica glass articles, having a surface which is resistant to coloring by electron rays which is suitable for use as the glass panel of a cathode ray tube. Said glass article being produced by a float process, an... | 01/30/1990 |
| 4895889 | Preceramic compositions Low density silicon nitride ceramics having improved bending and specific strengths over known silicon nitride ceramics derived from silicon nitride powder and polysilazane precursors are prepared by (A) intimately mixing about 50-85% by weight of silicon... | 01/23/1990 |
| 4892589 | Composition comprising water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose and water-soluble, nonionic hydroxyethyl cellulose A novel cementing composition comprising a hydraulic cement and, as a fluid loss agent, water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose, are disclosed. Preferably, the cementing composition further comprises water-soluble, nonionic... | 01/09/1990 |
| 4892846 | Reinforceable sintered glass-ceramics A fibre-reinforced ceramic material is made by making a melt of glass of specified composition, cooling the melt rapidly enough for it to solidify as a glass, crushing the glass to a particle size not exceeding 70 μm but preferably not exceeding 50 μm m... | 01/09/1990 |
| 4892849 | Ceramic composition having low friction coefficient at high operating temperatures A composite of a first metal ion and a ceramic composition in the near surface region of the composition is formed by ion mixing of the first metal with the ceramic composition. The composite has been oxidized at high temperatures thereby resulting in an ... | 01/09/1990 |
| 4891341 | Fine-grained ceramics and method for making the same High surface area, submicron ceramic powders are synthesized by reducing an oxide in the presence of another metal (i.e., Mg, Al, Ca, and the like) and a source of carbon, nitrogen or boron to form a new oxide and a carbide, nitride (or carbonitride). or ... | 01/02/1990 |
