The photoresist barrier layer of an inkjet printer printhead is processed to enable channels narrower than a predetermined width in the barrier layer to be created without blockage. Relatively large volumes of photoresist which form a wall of the channel are exposed to a partial exposure of electromagnetic...http://www.google.com.au/patents/US6489084?utm_source=gb-gplus-sharePatent US6489084 - Fine detail photoresist barrier
