A product provided with a coding pattern which comprises a plurality of marks, each of which represents one of at least two different values, and which further comprises a plurality of nominal positions, each of said plurality of marks being associated with a nominal position and the value of each mark...http://www.google.com/patents/US20100096458?utm_source=gb-gplus-sharePatent US20100096458 - Product provided with a coding pattern and apparatus and method for reading the pattern
