Patents by Inventor Dongju Li

Dongju Li 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).

  • System for fingerprint authentication based of ridge shape
    Patent number: 7035444
    Abstract: A system comprising means, which stores, regenerates, or matches shape of curves, by using a specified group of data in length to express a shape of curve. The system uses a sequence of several measure points on the curve, which are determined so as to make the same distances between those adjacent measure points. They are the data of lengths of arcs between starting measure point and ending measure points among every three consecutive measure points on the curve.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: April 25, 2006
    Inventors: Hiroaki Kunieda, Tsuyoshi Isshiki, Dongju Li, Tomohiko Otsuka, Mohamed Mostafa
  • System for fingerprint authentication
    Publication number: 20020071598
    Abstract: A system and means, which stores, regenerates, or matches shape of curves, by using a specified group of data in length to express a shape of curve. They use a sequence of several measure points on the curve, which are determined so as to make the same distances between those adjacent measure points. They are the data of lengths of arcs between starting measure point and ending measure points among every 3 consecutive measure points on the curve.
    Type: Application
    Filed: October 9, 2001
    Publication date: June 13, 2002
    Inventors: Hiroaki Kunieda, Tsuyoshi Isshiki, Dongju Li, Tomohiko Otsuka, Mohamed Mostafa