A bi-directionally scannable bar code pattern having a parallel array of alternating lines and spaces, each having selected widths. Each line has a common series of segments and segment spaces of selected lengths. The length of each segment may be the same as the width of a corresponding line, and the...http://www.google.com.au/patents/US5984193?utm_source=gb-gplus-sharePatent US5984193 - Printer media with bar code identification system
