Patents by Inventor Yukitoshi Hanafusa

Yukitoshi Hanafusa 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).

  • Semiconductor memory device
    Patent number: 8395961
    Abstract: A semiconductor memory device includes a plurality of memory cells, a plurality of bit lines respectively connected to the memory cells, a plurality of first and second word lines respectively connected to the memory cells, a plurality of first drivers for driving the first word lines selected during a read operation, and a plurality of second drivers for driving the second word lines selected during a write operation, the second driver having a different drive capability from the first driver's.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: March 12, 2013
    Assignee: Fujitsu Limited
    Inventors: Hirotoshi Sasaki, Yukitoshi Hanafusa
  • Semiconductor memory device
    Patent number: 8363506
    Abstract: A semiconductor memory device includes a plurality of memory cells, a plurality of bit lines respectively connected to the memory cells, a plurality of first and second word lines respectively connected to the memory cells, a plurality of first drivers for driving the first word lines selected during a read operation, and a plurality of second drivers for driving the second word lines selected during a write operation, the second driver having a different drive capability from the first driver's.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: January 29, 2013
    Assignee: Fujitsu Limited
    Inventors: Hirotoshi Sasaki, Yukitoshi Hanafusa
  • SEMICONDUCTOR MEMORY DEVICE
    Publication number: 20100329068
    Abstract: A semiconductor memory device includes a plurality of memory cells, a plurality of bit lines respectively connected to the memory cells, a plurality of first and second word lines respectively connected to the memory cells, a plurality of first drivers for driving the first word lines selected during a read operation, and a plurality of second drivers for driving the second word lines selected during a write operation, the second driver having a different drive capability from the first driver's.
    Type: Application
    Filed: June 8, 2010
    Publication date: December 30, 2010
    Applicant: FUJITSU LIMITED
    Inventors: HIROTOSHI SASAKI, YUKITOSHI HANAFUSA