Patent ID: 6969160

Claim:
A ballistic aerosol marking print head for depositing marking material, the print head comprising: a gas channel coupled to a propellant source; a reservoir in communication with the gas channel through an aperture; a first gating electrode located proximate a first side of the aperture; a second gating electrode located proximate a second side of the aperture; a third gating electrode located in the gas channel; a first voltage source having a first phase connected to the first gating electrode; a second voltage source having a second phase in phase separation from the first phase, the second voltage source connected to the second gating electrode; and a third voltage source having a third phase in phase separation from the second phase, the third voltage source connected to the third gating electrode; wherein the first phase, second phase and third phase are sequenced to energize the first gating electrode, the second gating electrode and the third gating electrode in consecutive series, so that marking material is metered from the reservoir into a propellant stream in the gas channel.