Patents by Inventor Gorab Majumdar

Gorab Majumdar 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 circuit
    Patent number: 6239998
    Abstract: An inverter circuit to reduce a resistor for overcurrent detection and decrease the number of filters in an inverter circuit for supplying polyphase power. Transistors each having a current detection terminal and a protective diode for regenerative current are adopted as switching elements on an “L” side and their current detection terminals are connected in common to a resistor. Therefore, a voltage drop caused by a current flowing in the resistor becomes larger when an overcurrent flows in at least one of the transistors and further when an overcurrent flows in a switching element on an “H” side even if no overcurrent flows in any one of the transistors.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: May 29, 2001
    Assignee: Mitusbishi Denki Kabushiki Kaisha
    Inventors: Gorab Majumdar, Mitsutaka Iwasaki, Tooru Iwagami, Khalid Hassan Hussein
  • Inverter circuit
    Patent number: RE39109
    Abstract: An inverter circuit to reduce a resistor for overcurrent detection and decrease the number of filters in an inverter circuit for supply polyphase power. Transistors each having a current detection terminal and a protective diode for regenerative current are adopted as switching elements on an “L” side and their current detection terminals are connected in common to a resistor. Therefore, a voltage drop caused by a current flowing in the resisytor becomes larger when an overcurrent flows in at least one of the transistors and further when an overcurrent flows in a switching element on an “H” side even if no overcurrent flows in any one of the transistors.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: May 30, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Gorab Majumdar, Mitsutaka Iwasaki, Tooru Iwagami, Khalid Hassan Hussein
  • Semiconductor device
    Patent number: D394244
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: May 12, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Gorab Majumdar, Satoshi Mori, Sukehisa Noda, Tooru Iwagami, Yoshio Takagi, Hisashi Kawafuji
  • Semiconductor device
    Patent number: D401912
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: December 1, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Gorab Majumdar, Satoshi Mori, Sukehisa Noda, Tooru Iwagami, Yoshio Takagi, Hisashi Kawafuji