Patents by Inventor Steven J. Shellhammer

Steven J. Shellhammer 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).

  • Error correction in macro bar code symbols
    Patent number: 6651893
    Abstract: A data encoding/decoding scheme includes a plurality of bar code symbols each carrying a portion of the data in which improved error correction capabilities are incorporated. According to one aspect, once data codewords have been derived to form the symbols, a first set of data correction elements are derived from a first field, then a second set of error correction elements are derived from the data elements and the first set of error correction elements using a second, wider field.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: November 25, 2003
    Assignee: Symbol Technologies, Inc.
    Inventors: Duanfeng He, Kevin Hunter, Steven J. Shellhammer, Sundeep Kumar