Patents by Inventor Buntarou Sawa

Buntarou Sawa 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).

  • Radio telephone apparatus
    Patent number: 5095541
    Abstract: A portable telephone apparatus which is capable of being selectively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control signal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the amplifier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: March 10, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideki Aisaka, Buntarou Sawa
  • Radio telephone apparatus
    Patent number: 5048117
    Abstract: A portable telephone apparatus which is capable of being selectively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control signal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the amplifier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: September 10, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideki Aisaka, Buntarou Sawa