Patents by Inventor Kiyofumi Higashimoto

Kiyofumi Higashimoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • HAFNIUM CARBIDE POWDER FOR PLASMA ELECTRODES, METHOD FOR PRODUCING SAME, HAFNIUM CARBIDE SINTERED BODY, AND PLASMA ELECTRODE
    Publication number: 20220185677
    Abstract: Hafnium carbide powder for plasma electrodes is represented by a chemical formula HfCx (where x=0.5 to 1.0). The content of carbon particles contained as impurities in the hafnium carbide powder is less than or equal to 0.03% by mass. The hafnium carbide powder preferably has an average particle size of 0.5 to 2 ?m. To produce the hafnium carbide powder, a pellet made from mixed powder of hafnium oxide and carbon is first placed in a second crucible made of silicon carbide. Then, the hafnium carbide powder is formed by heating the second crucible at 1800 to 2000° C. with the second crucible arranged in a first crucible made of carbon.
    Type: Application
    Filed: April 15, 2019
    Publication date: June 16, 2022
    Inventors: Daisuke Ihara, Yoshimi Sano, Hirohumi Yoshimoto, Hideaki Shimizu, Hideaki Hashimoto, Akihiro Takeuchi, Kiyofumi Higashimoto