Patent ID: 7744202
Filing Date: 2010-06-29
Classification: B41J

Abstract:
1. A method of supplying printing fluid, comprising: storing a free volume of printing fluid and air mixed together in a reservoir having an air-interface configured to provide bi-directional flow and a printing-fluid interface configured to provide bi-directional flow; establishing one bi-directional connection with the air-interface and one bi-directional connection with the printing-fluid interface; allowing printing fluid to exit the reservoir through the printing-fluid interface and allowing air to enter the reservoir through the air-interface as printing fluid is moved out of the reservoir through the printing-fluid interface during a first mode of operation; and allowing printing fluid to return to the reservoir through the printing-fluid interface and allowing air to exit the reservoir through the air-interface as the printing fluid is returned to the reservoir through the printing-fluid interface during a second mode of operation.