Patents by Inventor Yumiko Kitagawa

Yumiko Kitagawa 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).

  • File search method and apparatus, and index file creation method and device
    Patent number: 7143086
    Abstract: In order to search a file to be searched which includes records having fields allocated to each of a plurality of hierarchical levels and is constructed so that records having a same key character string in a field at a same hierarchical level are arranged in series, an index file is created by obtaining start position information and number information about records having a key character string contained in the hierarchical level of each node on the file to be searched, or a pointer to node management information of a lower hierarchical level, and by recording the information obtained for the nodes of all the hierarchical levels. Further, data is extracted from the file to be searched by using the record start position information, the record number information, and the pointer to the node management information of a lower hierarchical level recorded in the index file.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: November 28, 2006
    Assignee: Fujitsu Limited
    Inventors: Kenichiro Miyamoto, Yumiko Kitagawa
  • File search method and apparatus, and index file creation method and device
    Publication number: 20030101171
    Abstract: In order to search a file to be searched which includes records having fields allocated to each of a plurality of hierarchical levels and is constructed so that records having a same key character string in a field at a same hierarchical level are arranged in series, an index file is created by obtaining start position information and number information about records having a key character string contained in the hierarchical level of each node on the file to be searched, or a pointer to node management information of a lower hierarchical level, and by recording the information obtained for the nodes of all the hierarchical levels. Further, data is extracted from the file to be searched by using the record start position information, the record number information, and the pointer to the node management information of a lower hierarchical level recorded in the index file.
    Type: Application
    Filed: November 22, 2002
    Publication date: May 29, 2003
    Applicant: FUJITSU LIMITED
    Inventors: Kenichiro Miyamoto, Yumiko Kitagawa