Patents by Inventor Takao Soto

Takao Soto 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).

  • Data replication among storage systems
    Patent number: 7152079
    Abstract: A first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system acquires the journal via a communication line between the first storage system and the second storage system. The second storage system holds a duplicate of the data held by the first storage system and updates the data corresponding to the data of the first storage system in the data update order of the first storage system by using the journal.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: December 19, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Yusuke Hirakawa, Hiroshi Arakawa, Takahito Takeda, Takao Soto
  • Storage system
    Publication number: 20040267829
    Abstract: A first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system acquires the journal via a communication line between the first storage system and the second storage system. The second storage system holds a duplicate of the data held by the first storage system and updates the data corresponding to the data of the first storage system in the data update order of the first storage system by using the journal.
    Type: Application
    Filed: August 27, 2003
    Publication date: December 30, 2004
    Applicant: HITACHI, LTD.
    Inventors: Yusuke Hirakawa, Hiroshi Arakawa, Takahito Takeda, Takao Soto