1
Robert W Gundlach: Method for two-color development of a xerographic charge pattern. Xerox Corporation, James J Ralabate, Eugene O Palazzo, Max J Kenemore, March 14, 1978: US04078929 (165 worldwide citation)

A charge pattern of a single polarity and having at least three different levels of potential is developed in two colors by utilizing relatively negatively charged toner particles of one color and relatively positively charged toner particles of a second color.


2
Robert W Gundlach, Richard F Bergen: Fluid assisted ion projection printing. Xerox Corporation, Serge Abend, July 31, 1984: US04463363 (62 worldwide citation)

A fluid jet assisted electrographic marking apparatus for ion projection printing wherein ions are generated in a chamber, entrained in a rapidly moving fluid stream passing into, through and out of the chamber, modulated in an electroded exit zone by being selectively emitted or inhibited therein, ...


3
Richard F Bergen, Joseph A Chizuk Jr, Robert W Gundlach: Ionographic printing with a focused ion stream. Xerox Corporation, R Hutter, October 26, 1993: US05257045 (46 worldwide citation)

An ionographic printer directs a stream of ions from a source to a charge receptor to create an electrostatic latent image thereon. The ion stream passes through a relatively large aperture having associated therewith a focusing pinch electrode for narrowing the ion stream to a preselected width, an ...


4
Richard F Bergen, Robert W Gundlach, Remo D Ortenzio, Peter A Crean, Joseph A Chizuk: Apparatus for ionographic printing with a focused ion stream. Xerox Corporation, R Hutter, September 12, 1995: US05450115 (36 worldwide citation)

An ionographic printer directs a stream of ions from a source to a charge receptor to create an electrostatic latent image thereon. The ion stream passes through a relatively large aperture having associated therewith a pinch electrode for narrowing the ion stream to a preselected width, and displac ...


5
Joseph A Chizuk Jr, Richard F Bergen, Robert W Gundlach: Ionographic printing with a focused ion stream controllable in two dimensions. Xerox Corporation, R Hutter, April 1, 1997: US05617129 (35 worldwide citation)

An ionographic printer directs a stream of ions from a source to a charge receptor to create an electrostatic latent image thereon. The ion stream passes through a relatively large aperture having associated therewith a focusing pinch electrode for narrowing the ion stream to a preselected width, di ...


6
Robert W Gundlach: Selective tack imaging and printing. Xerox Corporation, V V Ralabate, V P O Sullivan, D M MacKay, March 28, 1978: US04080897 (21 worldwide citation)

Methods of imaging and printing are provided whereby a transparent self-supporting substrate is coated with a transparent abhesive polymer and an image formed by inking said polymer and simultaneously subjecting said polymer to electromagnetic radiation to reduce the cohesive force of said ink or in ...


7
Robert W Gundlach, Christopher Snelling: Method and apparatus for imaging on a heated intermediate member. Xerox Corporation, Duane C Basch, October 4, 1994: US05353105 (18 worldwide citation)

The present invention is a method and apparatus for printing using an intermediate member acting as a receptor for marking particles representing an image. The marking particles may be deposited directly or indirectly on the member, after which time the member is exposed, via an internal heat source ...


8
Robert W Gundlach, Richard F Bergen: Self-cleaning scorotron with focused ion beam. Xerox Corporation, William A Henry II, June 20, 1989: US04841146 (18 worldwide citation)

A self cleaning charging unit includes an insulating housing and a current limited, low capacitance corona wire positioned within the housing and located 0.5-6 mm away from biased conductive plates which form a slit through the bottom of the housing that allows ions to pass therethrough onto a recep ...


9
Robert W Gundlach, Richard F Bergen: Efficient, self-limiting corona device for positive or negative charging. Xerox Corporation, William A Henry II, May 27, 1986: US04591713 (18 worldwide citation)

A miniaturized scorotron corona generator for charging a thin wire or a receiver surface includes a sawtooth coronode partially surrounded by a conductive shield with a control screen attached to the shield. The control screen is closely spaced to the receiver surface such that fringing fields betwe ...


10
Robert W Gundlach, Eric G Rawson: Electrorheological based droplet ejecting printer. Xerox Corporation, April 11, 2000: US06048050 (18 worldwide citation)

Electrorheological based acoustic droplet ejectors and their applications in acoustic print heads are described. The droplet ejectors include an acoustic transducer which generates acoustic energy into a fluid well holding an electrorheological fluid such that the fluid's free surface is adjacent el ...