Patents by Inventor Keizo Ueno

Keizo Ueno 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).

  • Memory controller having a plurality of memory regions for protection against power failure
    Patent number: 7925843
    Abstract: A memory controller (1) writes data continuously to a first and a second blocks (20A), (20B) which are provided by dividing a memory region of a nonvolatile memory (2), and reads the data therefrom. The controller includes: a first writer (12A) which writes data to the first block (20A); and a second writer (12B) which writes data to the second block (20B) after completion of the writing by the first writer (12A) and a lapse of a waiting time generally equal to a length of time necessary for a power breakdown to drop a power source voltage down to a voltage value to at least disable the writing of data to the memory region.
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: April 12, 2011
    Assignee: Fujitsu Limited
    Inventors: Keizo Ueno, Masaki Okamoto
  • Memory controller
    Publication number: 20050122790
    Abstract: A memory controller (1) writes data continuously to a first and a second blocks (20A), (20B) which are provided by dividing a memory region of a nonvolatile memory (2), and reads the data therefrom. The controller includes: a first writer (12A) which writes data to the first block (20A); and a second writer (12B) which writes data to the second block (20B) after completion of the writing by the first writer (12A) and a lapse of a waiting time generally equal to a length of time necessary for a power breakdown to drop a power source voltage down to a voltage value to at least disable the writing of data to the memory region.
    Type: Application
    Filed: January 11, 2005
    Publication date: June 9, 2005
    Applicant: FUJITSU LIMITED
    Inventors: Keizo Ueno, Masaki Okamoto