UNITED J STATES PATENT OFFICE
Patented Nov. 15, 1949 ’ 2,488,507 UNITED j STATES PATENT OFFICE , SYNTHETIC STAR RUBIES AND STAR SAP PHIRES, AND PROCESS FOR‘ PRODUCING SAME John N. Burdick and John w. Glenn, Jr., Ken more, N. Y., assignors to The Linde Air Prod ucts Company, a corporation of Ohio No Drawing. Application August 27, 1947, Serial No. 770,942 19 Claims. (01. 63-82) 1 This invention relates to a process for develop Other-objects are to provide a process for ing asterism in natural and synthetic corundum developing asterism in single crystals of ruby. crystals, such as crystals of ruby and sapphire, and sapphire containing oxide of titanium; to which contain oxide of titanium dissolved in provide a process for obtaining star ruby and alumina. The invention is also concerned with .star sapphire gemstones from non-asteriated asteriated single crystals of synthetic corundum single crystals of ruby and sapphire containing as articles of manufacture, for example synthetic oxide of titanium; and to provide a process for star rubies and star sapphires. intensifying asterism inasteriated ruby and sap For more than thirty years massive nongran phire crystals. ular synthetic rubies and sapphires of gem qual 10 The term “massive non-granular,” as used ity have been produced commercially on a large herein, is intended to designate singlev crystals scale by the process of Verneuil, as disclosed in as distinguished from‘ a sintered or agglomerated U. S. Patents 988,230 and 1,004,505. In that proc mass of granules. Moreover, this term is further } ess powdered alumina, with or without small intended to designate crystals which are larger percentages of coloring oxides, drops through 15 than such tiny particles or granules of corundum an oxy-h'ydrogen ?ame, fuses, and accumulates as are commonly employed in abrasives, those on a refractory support until a long, narrow, crystals designated by the term “massive non approximately cylindrical boule of the desired granular” being, indeed, large enough to be used size is formed.
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