Patents by Inventor Jane Chan

Jane Chan 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).

  • Interface between threshold processing digitizer for bar code reader
    Patent number: 6082621
    Abstract: A multi-bit digitizer (30) for a barcode reader detects the presence of edges of a scanned barcode symbol, and also measures the strength of each detected edge. A polarity or edge direction signal (8) indicates the direction of each detected edge, and a timing signal (6) is representative of the timing and also, by means of a variable pulse width, the strength of each edge. A gating signal (200) indicates that the data are unreliable and invalid if the measured voltage applied to the scanner motor of the barcode reader is higher or lower than defined limit values. Any scans made at a speed which were too high or too low are rejected.
    Type: Grant
    Filed: November 9, 1994
    Date of Patent: July 4, 2000
    Assignee: Symbol Technologies, Inc.
    Inventors: Jane Chan, David Goren, Harry Kuchenbrod, Gary Serbin, Stephen Shellhammer, Glenn Spitz