Patents by Inventor Tatsuaki Umezaki

Tatsuaki Umezaki 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).

  • Air-conditioner power supply system for multi-system train car
    Patent number: 9796271
    Abstract: There is provided an air-conditioning apparatus including an auxiliary power supply that, when a voltage from an overhead line extending over sections powered by different power sources is stepped down with a transformer, converts the voltage into a low-voltage DC voltage and that, when a voltage from the overhead line is a DC voltage, is directly fed with the voltage and converts it into the low-voltage DC voltage that is the same as the converted DC voltage, and further including an inverter device that converts the DC voltage from the auxiliary power supply into an AC voltage and that supplies the AC voltage to a drive unit of a refrigeration cycle apparatus.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: October 24, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Keiji Yoshimura, Tatsuaki Umezaki
  • AIR-CONDITIONER POWER SUPPLY SYSTEM FOR MULTI-SYSTEM TRAIN CAR
    Publication number: 20140028091
    Abstract: There is provided an air-conditioning apparatus including an auxiliary power supply that, when a voltage from an overhead line extending over sections powered by different power sources is stepped down with a transformer, converts the voltage into a low-voltage DC voltage and that, when a voltage from the overhead line is a DC voltage, is directly fed with the voltage and converts it into the low-voltage DC voltage that is the same as the converted DC voltage, and further including an inverter device that converts the DC voltage from the auxiliary power supply into an AC voltage and that supplies the AC voltage to a drive unit of a refrigeration cycle apparatus.
    Type: Application
    Filed: May 29, 2012
    Publication date: January 30, 2014
    Inventors: Keiji Yoshimura, Tatsuaki Umezaki