Patents by Inventor Hidetoshi Fukunaga

Hidetoshi Fukunaga 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).

  • Inverter apparatus for driving a compressor motor and a method for manufacturing the apparatus
    Patent number: 6552912
    Abstract: A rectifier circuit (3) and a switching circuit (6) are mounted on a board (30). The board (30) is contained in a case (10) along with one or more capacitors (4, 5). In particular, the capacitors (4, 5) are laid sideways in the case (10).
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: April 22, 2003
    Assignee: Toshiba Carrier Corporation
    Inventors: Hidetoshi Kanazawa, Yukinobu Takahashi, Hidetoshi Fukunaga
  • Air conditioning apparatus capable of operating in cooling mode and heating mode
    Patent number: 5467606
    Abstract: An air conditioning apparatus comprising an indoor unit. The unit has a first indoor heat exchanger for cooling or heating indoor air and a second indoor heat exchanger for cooling or heating indoor air. A first indoor fan is located near the first indoor heat exchanger, for drawing the indoor air and supplying it through the first indoor heat exchanger to the zone of a room. A second indoor fan is located near the second indoor heat exchanger, for drawing the indoor air and supplying it through the second indoor heat exchanger to the zone of a room. The apparatus further comprises two temperature sensors for detecting the temperatures of the indoor heat exchangers, respectively. The higher or lower of the temperatures detected by the sensors is selected, in accordance with the cooling or heating mode in which the apparatus is operating. In accordance with the temperature selected, the air-supplying rates of the indoor fans are controlled.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: November 21, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiko Sasaki, Yasutoshi Tsuchiya, Hidetoshi Fukunaga
  • Air conditioning apparatus having a dehumidifying operation function
    Patent number: 5305822
    Abstract: An electric expansion valve is arranged between a first indoor heat exchanger and a second indoor heat exchanger. At a time of cooling operation, the electric expansion valve is fully opened to connect both the indoor heat exchangers to each other. At a time of dehumidifying operation the electric expansion valve is narrowed to apply a pressure reducing action across these indoor heat exchangers so that the first indoor heat exchanger acts as a reheater and the second indoor heat exchanger as an evaporator. The indoor air is cooled and dehumidified by the second heat exchanger and then reheated by the first indoor heat exchanger and blown into the room. At a time of dehumidifying operation, the temperature of the air blown into the room varies by controlling the speed of an outdoor fan.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: April 26, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsumi Kogetsu, Kanji Takebayashi, Shigeto Sumitani, Hiroaki Kuroyanagi, Takeshi Sato, Naozumi Sukegawa, Hidetoshi Fukunaga
  • Air-conditioner having refrigerant heater
    Patent number: 5169063
    Abstract: In this air-conditioner, combustion test of a refrigerant heater is conducted through a control valve on the basis of a minimum combustion command signal and a maximum combustion command signal set in advance at a plurality of stages to store values of the minimum combustion command signal and the maximum combustion command signal presenting an optimum combustion state from the above-mentioned command signals, whereby in an actual operation, control of the control valve is carried out by using stored values with respect to the minimum combustion command signal and the maximum combustion command signal.
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: December 8, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koichi Miyazaki, Takashi Kobayashi, Hidetoshi Fukunaga