Patents by Inventor Fujimasa Koyama

Fujimasa Koyama 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: 4106318
    Abstract: In the rolling of metallic material by using a rolling mill having a working roll for each surface of the workpiece reduced and having the shafts fixed with respect to movement in the direction of travel of the workpiece, the workpiece is rolled at such a high reduction rate in cross-sectional area that the contact angle .theta. between the working roll and the workpiece can have a value of .gtoreq. tan.sup.-1 .mu. (.mu. being the coefficient of friction between the working roll and the workpiece), and the rolling operation is carried out by pushing the workpiece between the working rolls, so that a neutral point of relative movements between the rods and the workpiece wire remain within the surface along which the working roll and the workpiece contact each other.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: August 15, 1978
    Assignee: Nippon Steel Corporation
    Inventors: Samon Yanagimoto, Minoru Kawaharada, Shuji Nagata, Fujimasa Koyama