Patents by Inventor Kenichi Takai

Kenichi Takai 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: 5771451
    Abstract: A method and apparatus of transmission power control to minimize a downward interference caused by the soft hand-off operation for a mobile station existing in the cell border in a cellular mobile communication system which uses a code division multiple access (CDMA) system for radio communication system are provided. The mobile station detects the signal power of pilot channels of the respective base stations A and B, and reports them to the respective base stations. Each base station calculates the propagation characteristic between the mobile station and the base station to determine a transmission power of the traffic channel, which is the most suitable level for the mobile station which is executing the soft hand-off operation, based on the relation among the reported information, the current transmission power of the pilot channel and the traffic channel.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: June 23, 1998
    Assignee: NEC Corporation
    Inventors: Kenichi Takai, Kyouji Watanabe
  • Patent number: 5736647
    Abstract: A vortex flowmeter detector is attached to or detachable from a vortex generation body for measurement of flow rate. The vortex flowmeter detector comprises a cylindrical oscillation tube having a bottom and a vortex detection part which is fixed by a fixing flange of the oscillation tube, wherein the oscillation tube is detachably inserted into a hole which is open to the vortex generation body at one end thereof, and the oscillation tube is fixed by a flange. An alternate pressure caused by a Karman vortex is introduced from both sides of the vortex generation body into the hole so as to oscillate the oscillation tube. This oscillation is received by a spring plate by way of an element cover, and it is transmitted to piezoelectric elements which are stuck to two chamfers of an elastic base material.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: April 7, 1998
    Assignee: Oval Corporation
    Inventors: Naoki Matsubara, Jun Tanimoto, Kenichi Takai, Shinsuke Imai
  • Patent number: 5532642
    Abstract: A feedforward-type distortion compensation circuit which can compensate for a non-linear distortion component generated by a main amplifier.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: July 2, 1996
    Assignee: NEC Corporation
    Inventor: Kenichi Takai