Patents by Inventor Tsutomu Setou

Tsutomu Setou 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).

  • Patent number: 5900189
    Abstract: The present invention provides a needle coke for graphite electrodes, wherein a needle coke, used as a raw material coke, comprises a coke of 100 parts by weight, to which adheres a substance of 0.03 to 16 parts by weight having a softening point, or a melting point, or a temperature at which it thermally decomposes without leaving a residue (after subjecting it to a heat treatment at 200.degree. C. or higher), which does not exceed 1800.degree. C., which substance comprises preferably 0.05 to 5 parts by weight of at least one boron, phosphorus or silicon compound, or pyrex glass. Also provided is a process for producing the needle coke. The use of the above needle coke in producing graphite electrodes can effectively inhibit puffing in a graphitizing step and improve the yield of the electrodes as well as enhancing product characteristics.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: May 4, 1999
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Youichi Kawano, Tsutomu Setou, Takanori Nishihata