Patent ID: 9289997
Filing Date: 2016-03-22
CPC Classification: B41J,C09D

Claim Text:
1. A black inkjet ink comprising: a liquid vehicle; a black colorant dispersed in said vehicle; and a colloidal dopant dispersed in said vehicle, said colloidal dopant being visually undetectable in a printed mark produced by said black ink after said ink is jetted onto a substrate, wherein said ink comprises about 0.10 wt. % to about 10 wt. % said colloidal dopant, wherein a drop of said ink increases light-scatter of an incident collimated light beam relative to a drop of said ink lacking said colloidal dopant, during drop-in-flight detection of light-scattering, and wherein said ink has a printed optical density that is at least 90% of that of the ink without said colloidal dopant.