Patent ID: 6942328

Claim:
A print cartridge, comprising: a cartridge body; a printhead supported by said cartridge body; an array of keying features defined on said cartridge body, each keying feature having one of a positive value and a null value; and a latch structure interposed within said array of keying features, wherein a positive value for a keying feature corresponds to that keying feature including an upstanding key block extending outwardly from said cartridge body, and a null value for a keying feature corresponds to that keying feature having substantially a space, wherein said keying features define a first keying pattern in a first direction, a second keying pattern in a second direction substantially perpendicular to said first direction, and a third keying pattern in a third direction substantially perpendicular to said first direction and said second direction, wherein at least one of said keying features of said third keying pattern has a positive value greater than binary “1” with said keying feature having a height commensurately greater than a unit height.