Patents by Inventor Tetsufumi Takayasu

Tetsufumi Takayasu 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).

  • Amplifier
    Patent number: 6411515
    Abstract: An amplifier for a portable telephone of the like is repaired or replaced without loss of an amplifying function even when the amplifier malfunctions. A plurality of door-shaped amplifier parts are provided on the left and right sides of an amplifier box. The left and right door-shaped amplifier parts can be mounted on opposite sides to each other. One amplifier part is in service and the other amplifier part is a backup. In a case where the amplifier part in service malfunctions, the other amplifier part is used or is mounted for use on the opposite side.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: June 25, 2002
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Yuzuru Sakamoto, Tetsufumi Takayasu, Masuo Shiratori
  • AMPLIFIER
    Publication number: 20020036892
    Abstract: The object of the present invention is to repair or to replace an amplifier for a portable telephone or the like without loss of an amplifying function even when the amplifier malfunctions. A plurality of door-shaped amplifier parts (10) are provided on the left and right sides of an amplifier box. The left and right door-shaped amplifier parts (10) can be mounted on opposite sides each other. One amplifier part (10) is in service and the other amplifier part (10) is a backup. In the case where the amplifier part (10) in service malfunctions, the other amplifier part (10) is used as it is or is mounted for use on the opposite side.
    Type: Application
    Filed: March 29, 2001
    Publication date: March 28, 2002
    Inventors: Yuzuru Sakamoto, Tetsufumi Takayasu, Masuo Shiratori
  • Portable radio telephone
    Patent number: D310366
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: September 4, 1990
    Assignee: Kokusai Electric Co., Ltd.
    Inventors: Kazuo Akaike, Masahiko Kobayashi, Osamu Utsunomiya, Ryuichi Takahashi, Tetsufumi Takayasu
  • Portable wireless telephone
    Patent number: D388431
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: December 30, 1997
    Assignee: Kokusai Electric Co., Ltd.
    Inventors: Tetsufumi Takayasu, Tatsuo Kuwayama, Takao Kumakoshi, Hiroshi Fujiwara
  • Holder for portable wireless car telephone
    Patent number: D392646
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: March 24, 1998
    Assignee: Kokusai Electric Co., Ltd.
    Inventors: Tetsufumi Takayasu, Tatsuo Kuwayama, Hiroshi Fujiwara
  • Battery charger for portable wireless phone
    Patent number: D402957
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: December 22, 1998
    Assignee: Kokusai Electric Co., Ltd.
    Inventors: Tatsuo Kuwayama, Tetsufumi Takayasu, Hiroshi Fujiwara