Patents by Inventor Willem Ishording

Willem Ishording 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).

  • Process and apparatus for the simultaneous and remote reading and certifying of an information present in a memory of an electronic medium
    Patent number: 4816651
    Abstract: Process for simultaneously reading and certifying, useing a processing device, an information present at an address in a memory of an electronic medium, in particular a removable and portable medium such as a memory card. The process uses a random number, generated in the processing device, as an encoding key for the address and the information read. Thus the information is certified if the sent address and the received address are identical. Preferably the encoding algorithm is the DES.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: March 28, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Willem Ishording