Patents by Inventor Warren Yung-Hang Tan

Warren Yung-Hang Tan 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).

  • Publication number: 20010045451
    Abstract: A method and system for token based user access authentication enables secure user access to a web server using a token, such as a smart card, and provides a single sign-on mechanism which does not employ a user name and password in the log on process. Instead, a smart card with a certificate enables the user at a client workstation to log on by authenticating himself or herself to the smart card with a Personal Identification Number (PIN). The smart card then uses mutual authentication to verify the identity of the cardholder and the access server and establishes a secure link between the client workstation and the access server with Secure Sockets Layer (SSL) protocol.
    Type: Application
    Filed: February 23, 2001
    Publication date: November 29, 2001
    Inventors: Warren Yung-Hang Tan, Joe Hsu, Fred Pinn
  • Patent number: 5844218
    Abstract: A smart card for financial transactions that can be programmed to operate using a variety of applications is disclosed. The card includes an interpreter that interfaces the smart card and an automatic teller machine or merchant terminal. The card includes a plurality of application modules each of which contain application programming that can be used by the interpreter to manage the card-to-system interface. At least one of the application modules can be reprogrammed to provide application programming for the interpreter that is compatible with the locally prevalent application program used by automatic teller machines and card terminals in the area where the cardholder is traveling.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: December 1, 1998
    Assignee: Transaction Technology, Inc.
    Inventors: Joseph C. Kawan, Warren Yung-Hang Tan
  • Patent number: 5768386
    Abstract: An improved touch screen encryption device and method is disclosed. The user selects information from prompts displayed on a touch screen. The improved device determines the input information based upon the location of the touch. The device encrypts the information--for example, the user's personal identification number--and sends the encrypted information to a remote processor. The device and method may be used by a financial institution (such as a bank), a postal services institution or wherever sensitive information is input through a touch screen.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: June 16, 1998
    Assignee: Transaction Technology, Inc.
    Inventors: Randal H. Yokomoto, Warren Yung-Hang Tan, Yosif Smushkovich, Xuan S. Bui, Michael Merman, Inas M. Dessouky, Cuong Do, Stephen M. Gryte, Phoebe Rin-Rin Hsu, Robert R. Propp, Michael L. Sears