04263504 is referenced by 133 patents and cites 6 patents.

A machine-readable matrix-type code has either repeated or non-repeated dot patterns in one direction representing digital characters which are read by a sensor moved in a direction which is generally normal to the patterns. The patterns of the code may be formed in a manner wherein the sensor views a portion of repeated patterns, or the code may be of lesser magnitude wherein the entire non-repeated pattern area is covered by the field of view of the sensor.

Title
High density matrix code
Application Number
6/62650
Publication Number
4263504
Application Date
August 1, 1979
Publication Date
April 21, 1981
Inventor
Jacob E Thomas
Ithaca
NY, US
Agent
George J Muckenthaler
Wilbert Hawk Jr
J T Cavender
Assignee
NCR Corporation
OH, US
IPC
G06K 19/06
G06K 7/14
View Original Source