Patent ID: 7938513

Claim:
A heater chip for a micro-fluid ejection head module, comprising: a substrate composed of silicon of a carrier wafer, said substrate containing a plurality of fluid supply vias extending therethrough from a back surface to a front surface thereof; at least one die composed of silicon of a device wafer separate from said carrier wafer, the die containing a plurality of fluid flow vias extending therethrough from a back surface to a front surface thereof and also containing electrical circuitry including a plurality of heater elements formed near said front surface, said heater elements interspersed with said fluid flow vias, said die being superimposed on said substrate such that said fluid flow vias of said die align with said fluid supply vias of said substrate and such that portions of said back surface on said die and portions of said front surface on said substrate align with one another and are disposed adjacent and facing one another; and a bond non-adhesively formed between said respective facing surface portions on said die and said substrate being hermetic in nature and directly attaching said die and substrate together.