Patents by Inventor Jan Barchan

Jan Barchan 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).

  • Method of providing an optical data carrier with identity information
    Patent number: 6226770
    Abstract: When manufactured, an optical data carrier is provided with digital information, which is written and stored in accordance with at least one previously defined encoding method for error correction and which may be read and decoded at a later stage by means of an optical reader with correction of errors in accordance with said encoding method. A predetermined number of logical symbols or bits are selected at predetermined positions in the digital information to be stored on the data carrier. A set of logical errors are intentionally created by replacing the selected symbols with corresponding symbols in a predetermined code sequence representing the identity of the data carrier. The logical errors are of such a type as to be normally corrected by the optical reader, when the data carrier is read and/or copied.
    Type: Grant
    Filed: January 4, 1999
    Date of Patent: May 1, 2001
    Assignee: Ifunga Test Equipment B.V.
    Inventor: Jan Barchan