ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,107, issued on March 17, was assigned to TOKUYAMA Corp. (Shunan, Japan).
"Silicon nitride powder for sintering" was invented by Hideaki Kawai (Shunan, Japan) and Satoru Wakamatsu (Shunan, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A silicon nitride powder for sintering which, despite of its fine powdery form, shows a very small increase in the oxygen concentration with time and features excellent storage stability. The silicon nitride powder for sintering has a specific surface area of 5 to 30 m2/g, and is characterized by having a hydrophobicity (M value) of 30 or more and an increase in the oxygen concentration of 0.30% by mass or less ...