Patent ID: 6679587
Filing Date: 2004-01-20
Classification: B41J,Y10T

Abstract:
A composite substrate of a fluid ejection device comprising:first and second opposed planar surfaces; a patterned etch mask formed adjacent to and between the opposed planar surfaces, the patterned etch mask having at least one opening defined therein; and a fluid channel fluidically coupling the first and second opposed planar surfaces through a hole in the opposed planar surfaces and the at least one opening in the patterned etch mask, such that fluid is capable of flowing from the second planar surface through the fluid channel to the first planar surface, wherein the patterned etch mast is adapted to mask areas of at least one of the first and second opposed planar surfaces when the hole in the opposed planar surfaces is formed, and wherein the first and second opposed planar surfaces are formed of silicon, and the patterned etch mask includes oxide located between the silicon.