Patents by Inventor Kazuhiko Hiraoka

Kazuhiko Hiraoka 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).

  • Railway vehicle with micro pressure wave reducing contour for tunnel travel
    Patent number: 5694858
    Abstract: To provide a high speed vehicle having a nose shape which reduces a pressure gradient of a micro pressure wave and secures the capacity necessary for each of the driver's cab and the passenger's cabin and the visibility necessary for driving, a nose shape is proposed having a tip region, an intermediate region and a rear region, respectively. The change rate of the sectional area from the tip toward the rear end is maximal in the tip region and progressively decreases towards the intermediate region and the rear region.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: December 9, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Iwao Harada, Morishige Hattori, Kazuhiko Hiraoka, Hideshi Ooba
  • Hydraulic excavator
    Patent number: D437602
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: February 13, 2001
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazuhiko Hiraoka, Shingo Hirose, Kazuhiko Nishiyama, Akitaka Takeuchi, Yoshiki Yoshida, Toichi Hirata, Masaki Kanahara, Tsuyoshi Sakyo, Yasushi Konomura, Koji Tahara, Kazuhisa Tamura
  • Audio disc player
    Patent number: D286041
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: October 7, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Hiraoka, Kazuhiko Nishiyama, Takao Itoh, Sadao Tani
  • Audio disc player
    Patent number: D289947
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: May 26, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Fumihito Katou, Kazuhiko Nishiyama, Kazuhiko Hiraoka, Takao Itoh, Sadao Tani
  • Ultrasonic flaw detector
    Patent number: D328714
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: August 18, 1992
    Inventors: Hiroaki Nakajima, Kazuhiko Hiraoka, Yukio Arima, Hiroaki Yanagimoto, Tetsuyoshi Tominaga