A thermal ink jet printhead has a flow directing one-way valve for reducing back-flow directed forces generated by the droplet ejecting ink vapor bubbles, so that most of the bubble generated forces are used to eject ink droplets from the printhead nozzles. The one-way valve is provided by patterning...http://www.google.es/patents/US5278585?utm_source=gb-gplus-sharePatente US5278585 - Ink jet printhead with ink flow directing valves
