A printhead chip for an inkjet printhead includes a wafer substrate that incorporates drive circuitry. The wafer substrate defines a plurality of ink inlet channels. Nozzle arrangements are positioned on the wafer substrate. Each nozzle arrangement includes a passive nozzle chamber structure that extends...http://www.google.de/patents/US6776476?utm_source=gb-gplus-sharePatent US6776476 - Ink jet printhead chip with active and passive nozzle chamber structures
