Patent ID: 7988264

Claim:
An ink printhead prepared by the process comprising: forming, as a single piece, an inner glass layer including a first side and a second side opposite the first side with each respective first side and second side comprising an array of fluid ejection units, each fluid ejection unit including a first nozzle portion and a firing chamber with the firing chamber aligned with, and in fluid communication with, the first nozzle portion, the respective fluid ejection units laterally spaced apart from each in a first direction; forming each of a first outer glass layer and a second outer glass layer as a single piece, with each respective first and second outer glass layer including a first side and a second side, the second side comprising an array of second nozzle portions laterally spaced apart from each other in the first direction with each respective second nozzle portion configured for reciprocally engaging the first nozzle portions of the respective first and second sides of the inner glass layer to define a nozzle of each respective fluid ejection unit; and bonding the inner glass layer in a sandwiched position between the respective first and second outer glass layers to align the respective second nozzle portions of the respective outer glass layers with, and be in fluid communication with, the respective first nozzle portions of the inner glass layer to define fluid ejection units on each of the opposite first and second sides of the inner glass layer.