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US 4,380,772 AGranted
Low ink indication for ink jet print head
AssigneeNCR Corporation
InventorVictor J. Italiano
Life of this patent
Estimating the term…
Abstract
A visual indication of low ink supply wherein a soluble-dye fluid is added to the ink supply and floats on the surface of the ink. The low ink supply is indicated by a change in color printed on the record media by reason of the indicating fluid having different characteristics from the printing ink.
Claims16
Means for indicating low ink supply comprising:
- means containing a supply of ink,
- means operably associated with said ink supply means for ejecting ink in droplet form onto record media, and a
- liquid placed on the surface of said supply of ink and different in color therefrom and visually observed on said record media when said ink supply is exhausted.
In an ink jet printer,
- means containing a supply of ink,
- means operably associated with said ink supply means for ejecting droplets of ink onto record media, and
- means for indicating an exhausted supply of ink upon visually observing a change in color of droplets of liquid on said record media.
Dependencies are inferred from the claim text.