ALEXANDRIA, Va., Aug. 18 -- United States Patent no. 12,709,821, issued on Aug. 18, was assigned to SLT Technologies Inc. (San Diego) and Kyocera Corp. (Kyoto, Japan).

"Heater for retrograde solvothermal crystal growth, method of making, and method of use" was invented by Mark P. D'Evelyn (Vancouver, Wash.), Paul M. Von Dollen (Brush Prairie, Wash.), Rajeev Tirumala Pakalapati (Vancouver, Wash.), Keiji Fukutomi (Vancouver, Wash.), Maimi Monzen (Ikoma, Japan), Koji Miyamoto (Ikoma-gun, Japan) and Motoi Tamaki (Suita, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus for solvothermal crystal growth includes a vertically oriented cylindrical pressure vessel defining a growth chamber, and a cylin...