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1. (WO2003053695) INK CARTRIDGE FOR INK LEVEL MANAGEMENT APPARATUS

Pub. No.:    WO/2003/053695    International Application No.:    PCT/US2002/039961
Publication Date: Jul 3, 2003 International Filing Date: Dec 12, 2002
IPC: B41F 31/02
Applicants: ACCEL GRAPHIC SYSTEMS, INC.
Inventors: MCANALLY, Charles K.,
HIBBITTS, Larry N.,
OLDENKAMP, Ralph J.,
Title: INK CARTRIDGE FOR INK LEVEL MANAGEMENT APPARATUS
Abstract:
An ink cartridge (46) for an ink management system includes a piston (50) having a stepped back surface (86) for improved reflection of ultrasonic acoustic waves through presentation of flat surfaces normal to the incident waves, thus permitting the piston to possess a preferred cone shape and structural rigidity. Heights of steps are preferably separated by even multiples of one-quarter wavelength of incident acoustic waves to avoid destructive interference from multiple reflections. Improved reflectivity overcomes problems with using an acoustic range finder to measure the position of the piston.