Patents by Inventor Mashiro Ueda

Mashiro Ueda 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).

  • Method for heat-treating steel rail head
    Patent number: 4886558
    Abstract: A method for heat-treating a steel rail head, which comprises: heating a steel rail head to the austenization temperature; then, cooling the rail head by means of a hot water jet until a surface temperature of the rail head decreases to a temperature not below 420.degree. C.; and then cooling the rail head by means of an air jet at least to the pearlite transformation temperature, thereby transforming the structure of a surface portion of the rail head into a uniform and fine pearlite structure. The above-described method includes a method in which the rail head is previously cooled by means of a water spray until the surface temperature of the rail head decreases to a temperature not below 530.degree. C. prior to the cooling of the rail head by means of the above-mentioned hot water jet.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: December 12, 1989
    Assignee: NKK Corporation
    Inventors: Toyokazu Teramoto, Akio Fujibayashi, Kozo Fukuda, Mashiro Ueda, Shinichi Nagahashi, Yazuru Kataoka, Hiroaki Sato, Tsunemi Wada, Takao Gino, Yoshio Saito, Kiyotaka Morioka