A drop on demand microfluidic ink jet printing system includes an ink flow chamber having a nozzle opening in a wall of the flow chamber through which ink droplets are ejected when ink in the flow chamber is at or above a predetermined positive pressure. An inlet channel opens into the flow chamber to...http://www.google.com.au/patents/US6568799?utm_source=gb-gplus-sharePatent US6568799 - Drop-on-demand ink jet printer with controlled fluid flow to effect drop ejection
