An inkjet printhead integrated circuit includes a substrate. A drive circuitry layer is positioned on the substrate, the substrate and the drive circuitry layer defining a plurality of ink inlet channels. Nozzle chamber walls and roofs spanning the nozzle chamber walls are positioned on the substrate...http://www.google.fr/patents/US7866797?utm_source=gb-gplus-shareBrevet US7866797 - Inkjet printhead integrated circuit
