Patents by Inventor Yoshiaki Hirai

Yoshiaki Hirai 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: 5736934
    Abstract: In a mobile radio communication system wherein mobile units are paged by repeatedly transmitting the same paging signal in n paging signal frames, the number of times a paging signal has been transmitted can be known at the receiving side without the need to transmit additional information, and a time diversity reception scheme can be employed at the receiving side, by forming the paging signal frames from n fixed-length subframes each of which contains a paging signal, and by positioning subframes that contain a new paging signal at one end of the paging signal frames, and, in the case of subframes containing paging signals that will be transmitted for the second or subsequent time, by arranging such subframes with a stagger in accordance with this number of times.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: April 7, 1998
    Assignee: NTT Mobile Communications Network, Inc.
    Inventors: Toshihiro Nozawa, Shogo Ito, Yoshiaki Hirai
  • Patent number: 5694196
    Abstract: An experimental instrument for examining permeability of a flowing cornea is used for imitating a lacrimal layer in the front part of a cornea or the back part of the cornea (an aqueous humor) by means of storing a various kinds of solutions comprises a cell body including a stirring part of a cylindrical wall and a bottom surface at a bottom part thereof, a constant temperature tank which surrounds the cell body all around a sample membrane setting part which is protrusively arranged at an outer surface of the call body and can set a sample membrane such as a contact lens used as a cornea or a corneal model, an outflow tube which is protrusively arranged at an outer surface of the stirring part and makes a solution in the cell body discharge, an inflow tube which is protrusively arranged at an upper part of the cell body and makes the solution flow inside of the cell body, a magnet rotator which is arranged inside the stirring part of the cell body, and a magnet stirrer which makes the magnet rotator inside
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: December 2, 1997
    Assignees: Kakuji Tojo, Senju Seiyaku Kabushiki Kaisha
    Inventors: Yoshiaki Hirai, Kakuji Tojo
  • Patent number: 5599175
    Abstract: A micro-flow controlling pump according to the present invention is used for controlling a micro-flow of a liquid in an experiment using a chemical agent for examining permeability of a membrane, reaction of a flow system, reflux of vital tissues, or the like. The micro-flow controlling pump includes: a pump body formed to have a cylindrical wall and a bottom surface, and be provided with an outflow tube formed at an outer surface of the cylindrical wall; a cover body formed to be detachably attached to the pump body and be provided with an inflow tube; a magnet rotator arranged inside the pulp body having criss-crossing blade parts; and a magnet stirrer arranged outside the pump body, having magnetic force by which the magnet rotator in the pump body can be rotated.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: February 4, 1997
    Assignees: Senju Seiyaku Kabushiki Kaisha, Kakuji Tojo
    Inventors: Kakuji Tojo, Yoshiaki Hirai