Patents by Inventor Hiroya Yoshida

Hiroya Yoshida 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).

  • IC card having improved security checking function
    Patent number: 5401950
    Abstract: An IC card is provided with a data storage area for storing data, an identification code area for storing a plurality of identification codes and directories for storing information indicating which of the identification codes is an identification code authorized to access the data.When an identification code and information for identifying data are applied so as to make access to a data area in the IC card from the outside of the IC card, the IC card references the directories, recognizes which of the identification codes is an identification code authorized to access data, corresponding to the externally applied information for identifying data, and determines whether or not the identification code corresponds to the externally applied identification code.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: March 28, 1995
    Assignee: Omron Tateisi Electronics Co.
    Inventor: Hiroya Yoshida