Patents by Inventor Toshikatsu Hazama

Toshikatsu Hazama 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).

  • DRAM with refresh control function
    Patent number: 6934211
    Abstract: A dynamic random access memory (DRAM) has a refresh-control function under control by an internal refresh-control signal. The DRAM includes: a cell array having a plurality of DRAM cells divided into a plurality of blocks, the DRAM cells being driven through word lines for data transfer with bit lines; a decoder to select word lines and bit lines connected to the cell array; a sense amplifier to amplify data on the bit lines; and a refresh controller to limit refresh to the cell array so that at least one externally-accessed block cell among the blocks is refreshed.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: August 23, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshikatsu Hazama, Masaaki Kuwagata
  • DRAM with refresh control function
    Publication number: 20040047205
    Abstract: A dynamic random access memory (DRAM) has a refresh-control function under control by an internal refresh-control signal. The DRAM includes: a cell array having a plurality of DRAM cells divided into a plurality of blocks, the DRAM cells being driven through word lines for data transfer with bit lines; a decoder to select word lines and bit lines connected to the cell array; a sense amplifier to amplify data on the bit lines; and a refresh controller to limit refresh to the cell array so that at least one externally-accessed block cell among the blocks is refreshed.
    Type: Application
    Filed: June 23, 2003
    Publication date: March 11, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshikatsu Hazama, Masaaki Kuwagata