Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Patent
1992-12-22
1995-06-20
Hartary, Joseh W.
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
347 93, B41J 2175, B41J 219
Patent
active
054264596
ABSTRACT:
A thermal ink-jet pen cartridge including an ink reservoir for maintaining ink under negative pressure. The ink reservoir is coupled to the printhead via a discharge port. To prevent air bubbles from entering the reservoir via the discharge port and printhead after ink is expelled via the thermal process, a check valve is placed in the fluid path between the ink reservoir and the printhead at the discharge port. The check valve is a mesh having a very small mesh opening sufficient to prevent air bubbles from passing through under normal pressures. The check valve also serves the function of a particulate filter to prevent contamination of the printhead by particles from the ink reservoir.
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Bobb Alrick
Hartary Joseh W.
Hewlett--Packard Company
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