An ink jet printing apparatus has a discharge recovery system that controls the amount of ink suction in a discharge recovery operation on the basis of a property of the ink in a cartridge mounted on the apparatus. The discharge recovery operation can also be controlled when the power to the ...http://www.google.com.au/patents/US5831646?utm_source=gb-gplus-sharePatent US5831646 - Controlling a discharge recovery operation according to a condition relating to an ink cartridge 
