Patents by Inventor Kenichi Hiratsuka

Kenichi Hiratsuka 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).

  • Publication number: 20140371347
    Abstract: The present invention provides a friction material having compatibility between a high effectiveness and a long life. For that purpose, a titanate compound and a cerium oxide are contained in the friction material, wherein the cerium oxide has an average particle size of 1 ?m or less.
    Type: Application
    Filed: November 26, 2012
    Publication date: December 18, 2014
    Inventors: Katsuya Okayama, Masaaki Kobayashi, Hiroya Kishimoto, Kenichi Hiratsuka
  • Patent number: 6214639
    Abstract: A method of producing a semiconductor device including a step of forming separation grooves in scribing regions defined at boundary portions between a plurality of semiconductor-device forming portions formed on a top surface of a semiconductor substrate; a step of defining portions of the scribing regions in the semiconductor substrate as substrate connecting portions; and a step of cutting off the substrate connecting portions along the separation grooves, to thereby separate the plurality of semiconductor-device forming portions into chips. These production steps contribute to a higher working efficiency in a later assembling process and to improved mass-production.
    Type: Grant
    Filed: August 3, 1999
    Date of Patent: April 10, 2001
    Assignee: Fujitsu Limited
    Inventors: Masaomi Emori, Mitsuji Nunokawa, Kenichi Hiratsuka, Masanori Ishii, Hiroshi Kawakubo
  • Patent number: 6170988
    Abstract: A self-acting air bearing wherein an abrasion-generated substance is generated by rotation of a shaft and a bearing and is used as a lubricant. As a result, a motor of low cost and stable rotation in which it is not necessary to insert special lubricant into the shaft or the bearing previously can be achieved. Moreover, in a polygon motor having such a lubrication structure, since polluting of a writing system is not feared, reliability for a long time period can be obtained.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: January 9, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuyuki Ohkubo, Yuzuru Kudoh, Kenichi Hiratsuka
  • Patent number: 4251691
    Abstract: A center-to-end type information service system utilizing the public telephone networks that are fundamental communication media of nation-wide scale is disclosed in which desired information is requested from the terminal side to the center by means of a telephone set or simplified keyboard and then delivered to and received by a TV receiver. A part of the center functions is transferred together with the exchange function to a subcenter located near the terminal. Thus, the length of transmission path connecting the center to terminals becomes shorter and the cost of the whole system can be cut down.
    Type: Grant
    Filed: December 1, 1978
    Date of Patent: February 17, 1981
    Assignees: Nippon Telegraph and Telephone Public Corporation, Hitachi, Ltd.
    Inventors: Hideto Kakihara, Kenichi Hiratsuka, Yoji Shibata, Wataru Kosuge