A process and apparatus for drop-on-demand ink jet printing utilize the steps of: selectively ejecting ink drops from drop ejection regions through related orifices; feeding ink through capillary feed passages to the drop ejection regions to replace ejected ink drops; and supplying ink to said capillary...http://www.google.ca/patents/US4929969?utm_source=gb-gplus-sharePatent US4929969 - Ink supply construction and printing method for drop-on-demand ink jet printing
