Patents by Inventor Daisuke Agawa

Daisuke Agawa 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).

  • Non-volatile semiconductor memory device with memory transistor
    Patent number: 7002846
    Abstract: In the present flash memory a threshold voltage of a memory transistor to which data is written is detected and the detected value is used to set an initial value of a pulse voltage of a write pulse signal, and whenever the write pulse signal is applied, the pulse voltage is increased by a step voltage. The memory transistor's drain current and the threshold voltage's variation can be smaller than when a fixed pulse voltage is applied, as conventional.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: February 21, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Hiromi Okimoto, Yoshikazu Miyawaki, Satoru Kishida, Daisuke Agawa
  • Non-volatile semiconductor memory device with memory transistor
    Publication number: 20050083737
    Abstract: In the present flash memory a threshold voltage of a memory transistor to which data is written is detected and the detected value is used to set an initial value of a pulse voltage of a write pulse signal, and whenever the write pulse signal is applied, the pulse voltage is increased by a step voltage. The memory transistor's drain current and the threshold voltage's variation can be smaller than when a fixed pulse voltage is applied, as conventional.
    Type: Application
    Filed: October 13, 2004
    Publication date: April 21, 2005
    Inventors: Hiromi Okimoto, Yoshikazu Miyawaki, Satoru Kishida, Daisuke Agawa