Class / Patent application number | Description | Number of patent applications / Date published |
501086000 | Synthetic precious stones (e.g., single crystals, etc.) | 8 |
20080227617 | Artificial Corundum Crystal - An artificial corundum crystal which can be put into practical use at low costs, and a process for producing the same. The artificial corundum crystal contains a seed crystal and has at least one crystal face selected from a { | 09-18-2008 |
20090069168 | Method of Converting PCA to Sapphire and Converted Article - Polycrystalline alumina (PCA) that has been doped with magnesium oxide is converted to sapphire by additionally doping the PCA with boron oxide and sintering to induce abnormal grain growth. The boron oxide may be added to an already formed green PCA ceramic shape by applying an aqueous boric acid solution to the green ceramic and heating the green ceramic in air to convert the boric acid to boron oxide. | 03-12-2009 |
20110130266 | METHOD AND APPARATUS FOR MAKING A HIGHLY UNIFORM LOW-STRESS SINGLE CRYSTAL BY DRAWING FROM A MELT AND USES OF SAID CRYSTAL - The method of making uniform low-stress crystals includes immersing a seed crystal held at a temperature under its melting point in a melt in a crucible and drawing it from the melt. The crystal and/or melt are rotated relative to each other and a planar phase boundary surface is maintained between them by detecting a surface temperature of the melt and/or crystal and controlling temperature fluctuations by increasing or decreasing the rotation speed. A low-stress crystal of formula: (A | 06-02-2011 |
20120015799 | METHOD FOR PRODUCING SAPPHIRE SINGLE CRYSTAL, AND SAPPHIRE SINGLE CRYSTAL OBTAINED BY THE METHOD - A method for producing a sapphire single crystal, which includes: performing a sapphire single crystal growth step wherein a sapphire ingot, which is an ingot of sapphire single crystal, is produced (step | 01-19-2012 |
20120088649 | MANUFACTURING TRANSPARENT YTTRIUM ALUMINUM GARNET BY SPARK PLASMA SINTERING - This invention provides a polycrystalline yttrium aluminum garnet (YAG) which is transparent in the visible and near infrared region. The invention also provides a method of manufacturing a transparent sintered YAG, which has nearly no porosity. | 04-12-2012 |
20130217562 | COLORED TRANSLUCENT ZIRCONIA SINTERED BODY, ITS PRODUCTION PROCESS AND ITS USE - A colored translucent zirconia sintered body contains a transition metal element as a coloring agent, having a clear color tone and high transparency, and being excellent in both design properties and esthetic properties, and its production process. A colored translucent zirconia sintered body includes yttria in an amount of at least 6 mol % and at most 15 mol % and at least one member selected from the group consisting of iron, nickel, manganese, cobalt, chromium, copper and vanadium in an amount of at least 0.02 mol % and at most 0.5 mol % as calculated as oxides, and having a porosity of at most 1,000 ppm. The average crystal grain size is preferably at most 60 μm. | 08-22-2013 |
20130237402 | SAPPHIRE MATERIAL AND PRODUCTION METHOD THEREOF - The present invention provides a method for manufacturing a corundum substance, comprising steps of providing a corundum crystal having an a-axis and a growth along the a-axis; and obtaining the corundum substance from the corundum crystal in a particular direction. | 09-12-2013 |
20160113363 | HEAT-RESISTANT SYNTHETIC JEWELRY MATERIAL - A heat-resistant synthetic jewelry material having a transparent, semitransparent or nontransparent composite nanocrystalline material on the basis of nanosized oxide and silicate crystalline phases. The material includes at least one of the following crystalline phases: spinel, quartz-like phases, sapphirine, enstatite, petalite-like phase, cordierite, willemite, zirconium, rutile, zirconium titanate, zirconium dioxide with a content of ions of transition elements, rare-earth elements and precious metals of from 0.001 to 4 mol %. One of the crystalline phases is additionally quartz-like solid solutions of lithium magnesium zinc aluminosilicates with a virgilite or keatite structure. The composition is selected from the following components, SiO2, Al | 04-28-2016 |