An ink dispensing device is disclosed wherein the ink releasing member comprises two layers that serve different purposes. The layer which contacts a printing font is made of a porous material that has an open pore size of less than 30 microns and a porosity of 40% to 85%. The second layer is adjacent...http://www.google.com.au/patents/US5136968?utm_source=gb-gplus-sharePatent US5136968 - Sustained release ink dispenser
