A closure member for each of the plurality of ink passages in an ink jet printhead chip that is the product of an integrated circuit fabrication technique includes a wafer substrate having a front surface and a rear surface. A plurality of ink passages are defined through the wafer substrate, so that...http://www.google.es/patents/US7284834?utm_source=gb-gplus-sharePatente US7284834 - Closure member for an ink passage in an ink jet printhead
Closure member for an ink passage in an ink jet printhead
